"Jeff, Who Lives at Home" hits theaters this weekend and features Jason Segel playing an overgrown child (big stretch) who lives with his mommy. Out in the real world, there are some celebrities who, every now and then, enjoy acting like big kids. Scroll through and check out stars gone child.
Jack Black may or may not be the guy who the movie "Jack" was based on. Conspiracy theorists and the four people who saw that 1996 Robin Williams movie often wonder how old Black thinks he really is.