Take a look at photos of famous pals -- including Ryan Gosling and Justin Timberlake, Connie Britton and Lauren Graham -- who were once roommates before making it big in Hollywood.
Michelle Williams and Ryan Gosling
To capture the intensity of their characters in the gritty drama Blue Valentine, the costars were asked to shack up for a week — but ended up living together for a month! "He's so hard to hate," Williams laughed. "It's hard. He does the dishes, and he takes care of the kids!"