Bridgit Mendler and her Good Luck Charlie co-star Samantha Boscarino celebrated their one year roommate anniversary this past weekend (they even bought a cake!). We can't believe they been living together for an entire year already. Especially since a lot of fans didn't even realize they were roommates in the first place!

Bridgit and Sam aren't the only co-stars who decided to live together after working together. Click through the gallery to see more celebrities who roomed together at one point in time, then let us know in the comments below who you're the most shocked to see!