So you've seen Camp Rock, right? No? OK, then you've at least watched Barney once or twice. You haven't? What are you, some kind of grown-up? Well, then, chances are you've yet to come in contact with young Ms. Demi Lovato, who got her start showing her gums on the purple dino's cute-fest at age six and her big break as a star of Disney's 2008 rock-camp-themed movie-musical. But you're going to be seeing a lot more of her: The Dallas, Tex., native stars in the Disney Channel series Sonny with a Chance and makes headlines for her BFF-ship with fellow Disney starlet Selena Gomez. And her buddies the Jonas Brothers (who also star in Camp Rock) worked with Lovato, a longtime singer-songwriter, to put together her debut album in 2008. For album two, 2009's Here I Go Again, she enlisted John Mayer as inspiration and collaborator. After that, Lovato went through a rough patch that resulted in her checking into a hospital for treatment for cutting and eating disorders. Rather than allowing that experience to sink her, though, Lovato worked hard, spoke out about the pressures on young girls and channeled her struggles into a new album, 2011's Unbroken.