Alexander Skarsgard was joined by his costars to premiere his new film, The East, at the Sundance Film Festival on Sunday. He posed for photos with Ellen Page and director Zal Batmanglij and happily greeted Brit Marling on the red carpet while she was taking pics. Later Alexander, Ellen, and Brit got together for a few friendly portraits to promote the movie, which follows a woman who is trying to infiltrate an anarchist group and becomes infatuated with the group's leader. Alexander, Ellen, and Brit are just a few of the celebrities who are showcasing their latest projects at Sundance. Check out some of our favorite celebrity moments from Sundance so far and be sure to follow POPSUGAR on Twitter and Instagram for live on-the-scene updates from Park City, UT!