Kate Middleton is pregnant, Buckingham Palace has confirmed!

The Duke and Duchess of Cambridge are expecting a baby, according to an official statement just released by palace officials, who confirm that Kate Middleton and Prince William, both 30, are adding a royal boy or girl to their mix.

Kate has been admitted to the hospital for Hyperemesis Gravidarum, a "very acute morning sickness, which requires supplementary hydration and nutrients," according to the duke and duchess' official website.

Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting a baby.

The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall and Prince Harry and members of both families are delighted with the news.

The Duchess was admitted this afternoon to King Edward VII Hospital in Central London with Hyperemesis Gravidarum. As the pregnancy is in its very early stages, Her Royal Highness is expected to stay in hospital for several days and will require a period of rest thereafter.

The official statement of Kate Middleton's pregnancy comes after an exhaustive set of baby rumors that have dogged the couple ever since their royal wedding in April 2011:

The new royal baby will obviously be the first for William and Catherine, who married in 2011 after a 10-year on-and-off courtship. He or she will be Queen Elizabeth II's third great-grandchild (after Savannah and Isla Phillips), Prince Harry's first niece or nephew and will make Pippa Middleton a proud aunt.

Our biggest congratulations to the Palace! And for the rest of us: buckle up. It's going to be quite a year.

See some of Kate's best photos!

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  • Royal tour of the Far East and South Pacific - Day Eight

    The Duchess of Cambridge gets into costume with locals at Vaiaku Falekaupule during a visit to Tuvalu, Solomon Islands, during a nine-day royal tour of the Far East and South Pacific in honour of the Queen's Diamond Jubilee.

  • Royal tour of the Far East and South Pacific - Day Two

    The Duchess of Cambridge during a visit to Gardens by the Bay in Singapore, as part of a nine-day tour of the Far East and South Pacific, with the Duke of Cambridge, in honour of the Queen's Diamond Jubilee.

  • Royal tour of the Far East and South Pacific - Day Two

    The Duchess of Cambridge during a visit to Gardens by the Bay in Singapore, as part of a nine-day tour of the Far East and South Pacific, with the Duke of Cambridge, in honour of the Queen's Diamond Jubilee.

  • Royal tour of the Far East and South Pacific - Day Three

    The Duchess of Cambridge during a visit to the Kranji War Memorial in Singapore, as part of a nine-day tour of the Far East and South Pacific, with the Duke of Cambridge, in honour of the Queen's Diamond Jubilee.

  • The Duchess of Cambridge visits the Olympic Park

    The Duchess of Cambridge plays hockey with the GB hockey teams at the Riverside Arena in the Olympic Park.

  • London Olympic Games - Day 10

    Duchess of Cambridge watches the Olympic Laser Radial medal race off Weymouth today.

  • Olympics Day 13 - Around the Games

    LONDON, UNITED KINGDOM - AUGUST 9: Prince Harry and Catherine, Duchess of Cambridge visit athletes at Team GB House in the Westfield Centre on Day 13 of the London 2012 Olympic Games on August 9, 2012 in London, England. (Photo by John Stillwell - WPA Pool/Getty Images)

  • Olympics Day 14 - Hockey: New Zealand v Great Britain

    LONDON, ENGLAND - AUGUST 10: Catherine, Duchess of Cambridge attends the Women's Hockey bronze medal match between New Zealand and Great Britain on Day 14 of the London 2012 Olympic Games at Riverbank Arena Hockey Centre on August 10, 2012 in London, England. (Photo by Pascal Le Segretain/Getty Images)

  • London Paralympic Games - Day 1

    LONDON, UNITED KINGDOM - AUGUST 30: Catherine, Duchess of Cambridge leaves the Velodrome after watching cycling events at the London 2012 Paralympic Games on August 30, 2012 in London, England. (Photo by Stefan Rousseau - WPA Pool/Getty Images)

  • London Paralympic Games - Day 1

    LONDON, UNITED KINGDOM - AUGUST 30: Catherine, Duchess of Cambridge arrives at the Aquatic Centre in the Olympic Park to watch the evening swimming session at the London 2012 Paralympic Games on August 30, 2012 in London, England. (Photo by Stefan Rousseau - WPA Pool/Getty Images)

  • 2012 London Paralympics - Day 1 - Cycling - Track

    LONDON, ENGLAND - AUGUST 30: Catherine, Duchess of Cambridge claps on day 1 of the London 2012 Paralympic Games at Velodrome on August 30, 2012 in London, England. (Photo by Bryn Lennon/Getty Images)

  • 2012 London Paralympics - Day 4 - Athletics

    LONDON, ENGLAND - SEPTEMBER 02: Catherine, Duchess of Cambridge takes part in the medal ceremony for the Men's Discus Throw - F42 on day 4 of the London 2012 Paralympic Games at Olympic Stadium on September 2, 2012 in London, England. (Photo by Stefan Rousseau - WPA Pool/Getty Images)

  • 2012 London Paralympics - Day 4 - Athletics

    LONDON, ENGLAND - SEPTEMBER 02: Gold medalist Aled Davies of Great Britain is presented his medal by Catherine, Duchess of Cambridge during the medal ceremony for the Men's Discus Throw - F42 on day 4 of the London 2012 Paralympic Games at Olympic Stadium on September 2, 2012 in London, England. (Photo by Miles Willis/Getty Images)

  • 2012 London Paralympics - Day 4 - Rowing

    WINDSOR, ENGLAND - SEPTEMBER 02: Catherine, Duchess of Cambridge arrives at the Eton Dorney venue to watch the days rowing competitions on day 4 of the London 2012 Paralympic Games at Eton Dorney on September 2, 2012 in Windsor, England. (Photo by Matthew Lloyd/Getty Images)

  • Royals Attend Thistle Service - Edinburgh

    Catherine, Duchess of Cambridge attends the Thistle Service for the installation of Prince William, Earl of Strathearn as a Knight of the Thistle at St. Giles Cathedral, Edinburgh on July 5, 2012

  • Diamond Jubilee - Service of Thanksgiving At St Pauls Cathedral

    Kate Duchess of Cambridge arrives at a service of thanksgiving at St Paul's Cathedral, London as part of the Diamond Jubilee celebrations Tuesday June 5, 2012. (AP Photo/Tim Hales, Pool)

  • Royal visit to Nottingham

    Catherine, Duchess of Cambridge smiles as she visits Vernon Park during a Diamond Jubilee visit to Nottingham on June 13, 2012.

  • Queen Elizabeth II Hosts A Garden Party At Buckingham Palace

    LONDON, UNITED KINGDOM - MAY 29: Catherine, Duchess of Cambridge attends a garden party at Buckingham Palace on May 29, 2012 in London, England. (Photo by Anthony Devlin - WPA Pool /Getty Images)

  • Duke and Duchess of Cambridge attend Imperial War Museum reception

    Catherine, Duchess of Cambridge attends a reception at the Imperial War Museum in London on April 26, 2012.

  • Royal visit to Leicester

    Catherine, Duchess of Cambridge listens to a welcome speech in Leicester City Centre as she accompanies The Queen and the Duke of Edinburgh to Leicester on March 8, 2012. The visit marks the first of Queen Elizabeth ll's Diamond Jubilee tours of the UK.

  • St Patrick's Day Parade

    The Duchess of Cambridge as she presents shamrocks to The Irish Guards at their St Patrick's Day Parade at the Mons Barracks in Aldershot. PRESS ASSOCIATION Photo. Picture date: Saturday March 17, 2012. Members of the 1st Battalion Irish Guards will receive traditional sprigs of shamrock from the Duchess of Cambridge at their St Patrick's Day parade today. See PA story ROYAL Barracks. Photo credit should read: Paul Vicente/Sunday Times/PA Wire

  • Duchess of Cambridge visits East Anglia's Children's Hospices

    Catherine, Duchess of Cambridge officially opens The Treehouse Children's Hospice in Ipswich on March 19, 2012.

  • Lucian Freud Portraits exhibition - London

    Catherine, Duchess of Cambridge visits the National Portrait Gallery on London on February 8, 2012.

  • War Horse UK Film Premiere - London

    Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the UK Premiere of War Horse at the Odeon, Leicester Square on January 8, 2012

  • The Duke And Duchess Of Cambridge Diamond Jubilee Tour - Day 2

    SINGAPORE - SEPTEMBER 12: Catherine, Duchess of Cambridge visits Gardens by the Bay on day 2 of the Diamond Jubilee Tour of the Far East on September 12, 2012 in Singapore. Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are on a Diamond Jubilee Tour of the Far East taking in Singapore, Malaysia, the Solomon Islands and the tiny Pacific Island of Tuvalu. (Photo by Mark Large - Pool/Getty Images)

  • Duke and Duchess of Cambridge 1st wedding anniversary

    File photo dated 21/04/12 ofthe Duke and Duchess of Cambridge arrive at Santa Barbara Polo Club in California, USA, where the Duke will play in a charity match.

  • Kate Middleton

    Kate, the Duchess of Cambridge, attends a rodeo demonstration at the Calgary Stampede on Thursday, July 7, 2011, in Calgary, Alberta. (AP Photo/The Canadian Press, Nathan Denette)

  • Duke and Duchess of Cambridge in Canada - Day Eight

    The Duke and Duchess of Cambridge leave the BMO Centre after a Rodeo reception, in Calgary, Alberta, Canada.

  • Duke and Duchess of Cambridge in Canada - Day Two

    The Duchess of Cambridge during her visit to the Canadian Museum of Civilisation in Gatineau, Quebec, where she and the Duke of Cambridge watched new citizens receive their Citizen certificates on Canada Day.

  • Duke and Duchess of Cambridge in Canada - Day One

    The Duchess of Cambridge waves to well-wishers, as she and the Duke of Cambridge arrive at the Rideau Hall in Ottawa Canada.

  • Duke and Duchess of Cambridge in Canada - Day Seven

    The Duchess of Cambridge at Parliament Hill in Ottawa for Canada Day celebrations on the second day of her visit to the Commonwealth country.

  • Duke and Duchess of Cambridge in Canada - Day Eight

    The Duchess of Cambridge arrives at Calgary Airport, Canada.

  • Duke and Duchess of Cambridge in Canada - Day Seven

    The Duke and Duchess of Cambridge watch the Canada Day's Evening show on Parliament Hill in Ottawa for Canada on the second day of their visit to the Commonwealth country.

  • Duke and Duchess of Cambridge 1st wedding anniversary

    File photo dated 05/07/11 ofthe Duke and Duchess of Cambridge during a visit to Blachford Lake near Yellowknife.

  • Duke and Duchess of Cambridge in Canada - Day Five

    The Duchess of Cambridge arrives in the province of Prince Edward Island during their visit to Canada.

  • Prince's Trust concert - London

    Catherine, Duchess of Cambridge arrives at the Royal Albert Hall in London to attend a concert in support of the Prince's Trust and The Foundation of Prince William and Prince Harry on December 6, 2011.

  • 2011 BAFTA Brits To Watch Event

    Catherine, Duchess of Cambridge arrives at the 2011 BAFTA Brits To Watch Event at the Belasco Theatre in Los Angeles, California.

  • Royal visit to open hospital unit

    Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit to The Royal Marsden Hospital on September 29, 2011 in Sutton, England.

  • Prince's Trust concert - London

    Catherine, Duchess of Cambridge arrives at the Royal Albert Hall in London to attend a concert in support of the Prince's Trust and The Foundation of Prince William and Prince Harry on December 6, 2011.

  • 2011 BAFTA Brits To Watch Event

    Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at the 2011 BAFTA Brits To Watch Event at the Belasco Theatre in Los Angeles, California.

  • William at 30

    File photo dated 30/04/11 ofthe Duke and Duchess of Cambridge walking hand in hand from Buckingham Palace in London the day after their wedding.

  • The Royal Wedding

    The Duchess of Cambridge leaves Clarence House to travel to Buckingham Palace for the evening celebrations following her wedding earlier.

  • The Royal Wedding

    Catherine Middleton arrives at Westminster Abbey with her sister and Maid of Honour Pippa Middleton to marry Prince William on April 29, 2011.

  • Britain's Prince William and his wife Kate, Duchess of Cambridge stand outside of Westminster Abbey after their Royal Wedding in London. AP Photo/Martin Meissner

  • President Obama state visit to UK- Day One

    The wife of U.S. President Barack Obama, first lady Michelle Obama (R), talks to Britain's Catherine, Duchess of Cambridge at Buckingham Palace, in London May 24, 2011. President Barack Obama on Tuesday begins a visit to Britain where he and Prime Minister David Cameron will review NATO action to help end conflict in Libya and Western policy towards uprisings in the Arab world. REUTERS/Toby Melville (BRITAIN - Tags: POLITICS SOCIETY ROYALS)

  • William and Kate visit Sutton - London

    Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit to The Royal Marsden Hospital on September 29, 2011 in Sutton, England.

  • The Chakravarty Cup Polo Match

    TETBURY, UNITED KINGDOM - JULY 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Kate Middleton watches Prince William and Prince Harry play in the Chakravarty Cup polo match at the Beaufort Polo Club on July 10, 2010 in Tetbury, England. (Photo by Indigo/Getty Images)

  • Prince William and Kate Middleton Attend Harry Meade And Rosie Bradford's Wedding

    CHELTENHAM, UNITED KINGDOM - OCTOBER 23: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Kate Middleton attends Harry Meade & Rosie Bradford's wedding at the Church of St. Peter and St. Paul, Northleach, on October 23, 2010 in Cheltenham, England. (Photo by Indigo/Getty Images)

  • Royal engagement

    Prince William and Kate Middleton pose for photographs in the State Apartments of St James Palace on November 16, 2010 in London. After much speculation, Clarence House today announced the engagement of Prince William to Kate Middleton. The couple will get married in either the Spring or Summer of next year and continue to live in North Wales while Prince William works as an air sea rescue pilot for the RAF. The couple became engaged during a recent holiday in Kenya having been together for eight years.

  • Duke and Duchess of Cambridge waxworks

    File photo dated 16/11/2010 of the Duke and Duchess of Cambridge during a photocall in the State Apartments of St James's Palace, London to mark their engagement.

  • Princes William And Harry Compete In The Dorchester Polo Trophy

    CIRENCESTER, UNITED KINGDON - JUNE 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Kate Middleton watches HRH Prince William and HRH Prince Harry compete in The Dorchester Trophy polo match at Cirencester Park Polo Club on June 7, 2009 in Cirencester, England. (Photo by Indigo/Getty Images)

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When asked about his daughter-in-law's pregnancy, Prince Charles told reporters, "It's a very nice thought to become a grandfather in my old age, if I can say so... I'm thrilled, marvelous."

He also jokingly alluded to Wednesday's hoax, when two Australian radio hosts prank-called Kate's hospital pretending to be the Prince of Wales and Duchess of Cornwall. When approached by reporters today, he replied, "How do you know I'm not on a radio station?"

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The Duchess of Cambridge was discharged from King Edward VII Hospital on Thursday after a 3-day stay. Facing the press as she exited the building with Prince William, she said, "I'm feeling much better, thank you."

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@ ariannahuff : .@lisabelkin: "What Kate Middleton lost when her pregnancy was announced" http://t.co/jaFbqsOb

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Prince William and Kate Middleton's plan to move into Kensington Palace has now been pushed to October 2013 due to asbestos. According to The Daily Mail, the "couple will be shuttling between rented farmhouse on Anglesey in North Wales and Nottingham Cottage in grounds of Kensington Palace."

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According to The Telegraph, it says: "God our creator, we thank you for the wonder of new life and for the mystery of human love. We pray for William, Duke of Cambridge and Catherine, Duchess of Cambridge as they prepare to receive the gift of their child. We thank you that we are known to you by name and loved by you from all eternity, through Jesus Christ our Lord. Amen."

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@ SkyNewsRoyal : #Royal #Pippa and #James Middleton have just departed the hospital where #Kate is, having stayed for approx 2hrs

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@ britishroyals : Pippa & James Middleton are in the hospital to see Kate. Lovely! # royalbaby

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Prince William smiles as he enters King Edward VII Private Hospital to visit his pregnant wife on Dec. 5 in London.

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Just one day after Kate Middleton arrived at King Edward VII Hospital in London, two radio hosts from 2Day FM, a Sydney-based station, decided to play a little prank and ring up the hospital pretending to be Queen Elizabeth II and Prince Charles. And it actually worked -- their call went through a receptionist before they were transferred to the Duchess of Cambridge's nurse.

Here's what happened.

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UsWeekly reports: "I was so pleased to hear the good news and wish mother and baby every health and happiness," Playboy's September 2012 cover girl said of her expecting relative who she has never met.

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@ HuffPostMedia : The media squeals over Kate Middleton's pregnancy http://t.co/HvnpNIOx

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"I would say Harry and Pippa, a Van Cutsem, and maybe one of Kate's close chums from school and that might be it," Joe Little, Managing Editor of the Majesty royal magazine told The Daily Mail.

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Just one day after the big news was announced, Kate Middleton's sister, Pippa, has stepped out in London alone. No word on if or when she plans to visit Kate in the hospital.

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The world ballooned with excitement at the announcement of Kate Middleton's pregnancy, but will the royal style icon change how we see maternity wear?

We dished on this and more on HuffPost Live today.

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@ QueenVicMirror : The palace made it clear earlier today they will not be providing updates on Kate's health unless there is a significant change to report

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@ britishroyals : Prince William has just left the hospital. He was smiling

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After a second day in King Edward VII Hospital, reports the Daily Mail, the duchess is "responding well to treatment." She is reportedly on an IV drip to restore the nutrients she's lost and is being treated by two top "royal doctors." But the Daily Mail adds that Kate's vomiting, a symptom of hyperemesis gravidarum, might last through almost the entire pregnancy.

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“My hyperemesis put my whole family -- and me -- through hell. It’s a depressing and crazy-making illness,” says one woman who suffered from Kate's condition. Read more about hyperemesis gravidarum here.

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While Prince William has already visited his ill wife at the hospital twice, People magazine reports that the queen won't be stopping by. "She doesn't normally go because it disrupts the running of the hospital," says a source. "And the Duchess just wants to recover and get out."

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ABC News reports that Kate will stay at King Edward VII Hospital in London for "several more days" then continue a "period of rest" back at home.

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The Telegraph writes:

If 2012 has belonged to the Queen, as she marked her Diamond Jubilee, next year’s headlines look likely to be stolen by the Duke and Duchess of Cambridge’s baby. The monarchy is more secure than ever.

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"The duchess will not be attending the public engagements this week, as she will be in hospital for a few days and will then need to rest," according to a representative for the Buckingham Palace, E! News reports.

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The Royalist over on The Daily Beast has some new details on how the Royal Family learned the news. The Queen apparently found out today and Prince Harry found out via email.

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Kate's announcement overshadowed another, Vanity Fair notes:

Sadly for the Pope, though, less than six hours after Yahoo reported his new Twitter handle, St. James’s Palace in London confirmed that the Duke and Duchess of Cambridge are expecting a child, effectively knocking the Pope from his slot in today’s Google Trends.

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Earl Spencer, Princess Diana's brother, congratulates the happy couple.

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@ Wilkinson_David : Breaking: William just left hospital #royalbaby

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