Demi Lovato, born August 20th, 1992 is a singer and a songwriter who also plays guitar and piano. She began acting at the age of 10. She previously starred in Sonny With A Chance and is currently a judge on X Factor, beginning her second season in fall 2013. Joe Jonas, born August 15, 1989, is the middle brother of the band, Jonas Brothers. He is mostly known for playing the tambourine and starring in the tv show JONAS. They performed duets in the Disney Channel Camp Rock movies (This Is Me Read more on Last.fm