Did you know that a ton of your favorite celebs guest starred on Sonny With a Chance with Demi Lovato when it was still on the air? Some of them were even on the show before you knew who they were!

Click through to see 10 celebrities you probably forgot guest starred on the Disney Channel show, then let us know in the comments below who you're the most shocked to see. Do you remember any of them on the show?

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