Ever watch a movie or TV and see a celebrity thinking, "Hey, that's (insert name here)!" and come to find out it's another celeb who looks JUST LIKE the one you thought it was? Happens all the time... especially if you've seen that movie The Roommate with Minka Kelly and Leighton Meester (who look exactly alike!) and realized that they're actually not twins nor the same person. Here are 12 celebrities we're convinced were separated at birth!