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 welcomed Joe Jonas’ ex-girlfriend, Demi Lovato, onstage for a surprise performance at their first concert on their Jonas20: Greetings from Your Hometown tour at New Jersey’s MetLife Stadium on Sunday night.

Reflecting on her recent surprise appearance at a Jonas Brothers' concert, the 32-year-old singer called the performance both 'special' and 'healing.'

Joe, Kevin and Nick of the Jonas Brothers and Lovato starred in the 2008 Disney Channel Original Movie, Camp Rock, and it’s 2010 sequel Camp Rock 2: The Final Jam, where Joe and Lovato play love interests onscreen. The pair also dated in real life in 2010.

The relationship between Tommy Fleetwood and his wife, Clare Fleetwood, sparked interest after the pro golfer suffered another heartbreak at the FedEx St. Jude Championship. Tommy, 34, had a two-shot lead as he teed off at the 16th hole at TPC Southwind in Memphis, Tennessee, on Sunday, August 10. However, after a bogey on the

Lovato joined the Jonas Brothers to perform songs from "Camp Rock," sparking Disney Channel nostalgia for their fans.

The band — consisting of brothers Joe, Nick and Kevin Jonas — kicked off their 20th anniversary tour on Sunday at MetLife Stadium in their home state of New Jersey. But to make it more special, they surprised their fans with some special guests throughout the show, including Demi Lovato .

For Demi Lovato, reuniting with the Jonas Brothers at the kickoff show for the band’s 20th anniversary tour was “an instant yes.” The former Disney stars performed together for the first time in over a decade at East Rutherford,

Disney fans assemble! Demi Lovato and Joe Jonas reportedly reunited for a nostalgic performance at Jonas Brothers’ MetLife Stadium concert on August 10.