Demetria Devonne Lovato (born August 20, 1992) is an American singer, songwriter, and actor. They were first in "Barney & Friends" (2002–2004), but became more popular from being in the television movies "Camp Rock" (2008) and its sequel "" (2010). One of the songs on the first "Camp Rock" movie was "This Is Me", which they sang with Joe Jonas. This song was popular and was in the "Billboard" Hot 100.