It's Emily Osment's 23rd birthday today! Even though we mostly think of her as Lilly Truscott on Hannah Montana, she actually made a short appearance on the classic sitcom Friends when she was only nine years old. (And she was pretty freaking adorable.)

In fact, she's not the only star who had one of her first roles on the hit television show. Click through to see more celebs who guest starred on the show before they got famous, and let us know which one shocked you the most in the comments! Do you wish Friends was still on the air?

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