Demi Lovato
Long before she rocked purple hair, Demi Lovato rocked out with the world's most famous purple dinosaur. She spent two seasons alongside her childhood best friend Selena Gomez in the late 1990s on "Barney & Friends." Like Gomez, she eventually moved on to entertaining tweens on the Disney Channel. She started with shorts between shows, moved on to the 2008 Jonas Brothers vehicle "Camp Rock," and in 2009 got her own series, "Sonny With a Chance," and did "Princess Protection Program" with Gomez. In 2008, she released her first CD, Don't Forget, which featured the Jo Bros. After months of
