The "Social Network" star is a huge animal supporter and has joked that he has the potential to develop a problem. "I'm a foster parent for cats and the more movies I do, the more guilty I feel -- and the more cats I feel the need to get to alleviate the guilt from doing the movies. And then if a movie is, God forbid, popular … then I have to get even more cats," he once told Conan O'Brien. "My life is basically just feeding and cleaning cats. And then I get to be the Sexiest Geek Alive." He gets our vote!