Demi Lovato

Demetria Devonne "Demi" Lovato (born August 20, 1992) is an American actress and singer-songwriter. A former child star who played Angela on Barnie & Friends, Lovato is best-known for her starring Disney Channel roles as Mitchie Torres in Camp Rock (2008) and its 2010 sequel, and Princess Rosalinda in Princess Protection Program (2009). She also starred as Sonny Munroe in the Disney Channel television series, Sonny with a Chance. Lovato is currently a celebrity judge on The X Factor.