Matt Damon was in character on the Vancouver set of Elysium Saturday. Matt wore a prison jumpsuit and sported fake neck tattoos for the movie, which he started shooting on location in Canada over the Summer. The role required Matt to shave his head, and he showed off the look while promoting Contagion last month. With the thriller behind him, Matt can focus on his upcoming projects including We Bought a Zoo, which will be out this holiday season, and his Liberace biopic, which will go into production soon. The Steven Soderbergh film about the popular 1950s performer has been titled Behind the Candelabra and will apparently air on HBO. Matt was stuck working over the weekend, but he still found a way to participate in Bill Clinton's star-studded birthday festivities. Matt teamed up with Ben Stiller, Kristen Wiig, Sean Penn, and more to shoot a Funny or Die video that aired during the Decade of Difference concert. On top of his busy career, Matt Damon just celebrated his own birthday and we took a look back at his sweet moments with family and friends.