Demetria Devonne "Demi" Lovato ( DEM-ee lə-VAH-toh; born August 20, 1992) is an American singer, songwriter, and actress. After appearing on the children's television series Barney & Friends (2002–2004), she starred in the Disney Channel short series As the Bell Rings (2007–2008). Lovato rose to prominence for playing Mitchie Torres in the...