Have you ever had an "oh em gee" moment when you're watching one of your favorite older movies and suddenly realize that a major celebrity just made a guest appearance? It happens to us all the time. It's crazy how many films your favorite stars were in before they were famous.
Click through to see 10 movies you had no idea celebs like Selena Gomez and Josh Hutcherson were in, then let us know in the comments below which roles surprise you the most.
Ashley Benson was in 13 Going on 30. She played one of girls who used to pick on Jenna when she was younger.