Aug. 11 (UPI) -- Demi Lovato surprised fans by joining the Jonas Brothers during their first show on the Jonas20: Greetings From Your Hometown Tour in New Jersey Sunday.
Lovato, 32, had previously starred opposite Joe Jonas, 35, in the 2008 Camp Rock film and its 2010 sequel, and the pair performed songs from the movies, including "Wouldn't Change a Thing" and "This is Me," on Sunday.
Lovato and Joe Jonas briefly dated in 2010.
Brothers Kevin Jonas, 37, and Nick Jonas, 32, also appeared in Camp Rock.
Demi Lovato's husband, Jordan Lutes, cheered for his wife from off stage.
