Kristen Stewart and Garrett Hedlund at Skywalker Ranch

Kristen Stewart and Garrett Hedlund headed north for a special Vanity Fair screening of On the Road in Marin County, CA, last night. Kristen wore leather pants from H&M and a jacket by BCBG. The costars posed for photos and participated in a Q&A at the event, which was held at George Lucas's Skywalker Ranch. Producer Francis Ford Coppola was on hand, as was director Walter Salles. Kristen and Garrett are ramping up promotion for their film ahead of its limited NYC release on Dec. 21. They got together for another screening in LA on Thursday after Kristen dressed up for an appearance at the Academy of Motion Pictures Arts and Sciences' fourth annual Governors Awards last weekend. Her schedule isn't slowing down either, since Kristen is expected to attend the 12-12-12 Hurricane Sandy fund-raiser at Madison Square Garden next week.