Demi Lovato

For such a young starlet, Demi Lovato has already had a rollercoaster of a career. Demi had her breakout role in the Disney movie Camp Rock alongside the Jonas Brothers. After the film, Demi toured with the JoBros and released two of her own hit albums. Demi also landed her very own Disney series, Sonny with a Chance. But it wasn't until 2010, when Demi suffered a supposed nervous breakdown on tour and sought treatment at a rehab center that the Disney star really made headlines.