Did you know that Selena Gomez guest starred on Hannah Montana before she got her own Disney Channel show Wizards of Waverly Place? And she's not the only one! A ton of your favorite celebrities were in one or two episodes of HM alongside Miley Cyrus before they made it big.

Click through, then let us know in the comments below who you're the most surprised to see on the show. How many guest stars do you remember?