Demi Lovato joined the Jonas Brothers onstage for the opening night of their tour at MetLife Stadium in New Jersey.

Demi Lovato surprises fans by joining the Jonas Brothers at the Jonas20 anniversary tour opener for a “Camp Rock” reunion.

The pair sang "This Is Me" and "Wouldn't Change a Thing," 17 years after the Disney Channel original movie was released.

The Jonas Brothers opened the Jonas20 tour with Joe Jonas reuniting with Demi Lovato for the first "Camp Rock" performances ...

It’s been 17 years since the first ‘Camp Rock’ movie was released, but since Demi’s reunion with the Jonas Brothers, fans are ...

The Jonas Brothers welcomed Joe Jonas’ ex-girlfriend, Demi Lovato, on stage for a surprise performance at their first concert ...

The Disney Channel alums performed "Gotta Find You," "This Is Me," and "Wouldn't Change a Thing" for an enthralled audience ...

Joe, Nick and Kevin kicked off their 20th anniversary tour with Sunday night’s show at MetLife, one of the largest venues ...

The Jonas Brothers surprised fans Sunday night by bringing out a surprise guest at their 20th anniversary tour: Demi Lovato.

Demi Lovato surprised fans by joining the Jonas Brothers during their first show on the "Jonas20: Greetings From Your ...

Exes Demi Lovato and Joe Jonas teamed up for a few 'Camp Rock' classics at kick-off of the Jonas Brothers' 20th anniversary tour on Sunday (Aug. 10).

Joe Jonas and Demi Lovato reunited for a long-awaited Camp Rock reunion alongside Nick Jonas and Kevin Jonas for the opening ...