Demetria Devonne Lovato ( lə-VAH-toh; born August 20, 1992) is an American singer and actress. After appearing on the television series Barney & Friends (2002–2004), she rose to prominence for her role as Mitchie Torres in the musical television film Camp Rock (2008) and its sequel Camp Rock 2: The Final Jam (2010); the former film's soundtrack contained "This Is Me", Lovato's debut single and duet with Joe Jonas, which peaked at number nine on the Billboard Hot 100.