Alyson Stoner's music video for her new song "Pretty Girls" came out yesterday and we haven't been able to stop watching it – she looks so grown up in it! It's hard to believe that she's the same girl who voiced Isabella in Phineas and Ferb!

A bunch of your favorite stars have actually lent their voice to the Disney Channel show. Click through to see 10 celebs you had no idea portrayed characters on Phineas and Ferb and let us know in the comments below who you're the most shocked to see.

Love J-14? Be sure to subscribe to our YouTube channel for fun, exclusive videos with your favorite stars.