Demi Lovato, the 16-year-old singer/actress, opened for Jonas Brothers on their sold-out “Burnin’ Up” 2008 summer tour, impressing critics and fans along the way with her powerhouse voice and musical abilities on both piano and guitar. But with her Hollywood Records debut album “Don’t Forget,” Demi throws away the textbook. Instead, she rewrites the rules, making music her way. Demi Lovato and special guest, American Idol season seven finalist David Archuleta visit the St. Pete Times Forum on Friday, July 31st at 7pm.