Demetria Devonne \"Demi\" Lovato [ 2 ] (born August 20, 1992) [ 1 ] is an American singer-songwriter, musician, and actress. Her earliest roles included a part on Barney & Friends , before she became better known for her starring roles in the Camp Rock movies, as Sonny Munroe in Sonny with a Chance , and as thestar of the 2009 movie Princess Protection Program . She is also involved in philanthropic activities through charity work and various social and environmental causes. [ 3 ] As a solo musical artist, Lovato released her debut album Don\'t Forget on September 23, 2008. The album debuted at #2 on the Billboard 200 selling 89,000 copies in the first week. [ 4 ] It has since sold over 500,000 records in the United States and got certified Gold by RIAA . [ 5 ] Lovato stated in an interview that the album was recorded in ten days. [ 6 ] Lovato released her second album, Here We Go Again , on July 21, 2009. [ 7 ] The album debuted at#1 on the Billboard 200, selling 108,000 copies in the first week. [ 8 ]