Demi Lovato, perhaps the most notable guest so far, was greeted by ear-shattering shrieks from millennial fans when she ...

For Demi Lovato, reuniting with the Jonas Brothers at the first show of the band's 20th anniversary tour on Sunday night was ...

Joe, Kevin and Nick of the Jonas Brothers and Lovato starred in the 2008 Disney Channel Original Movie, Camp Rock, and it’s ...

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

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

The band — consisting of brothers Joe, Nick and Kevin Jonas — kicked off their 20th anniversary tour on Sunday at MetLife ...

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

Demi Lovato stole the show at the Jonas Brothers concert in a sage green Acne Studios look featuring a triangle bra top and ...

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

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

- Dean Lewis, the Australian pop balladeer of “Be Alright” fame, trotted out mid-set to perform the new “Greetings” tune ...

Lovato and the Jonas brothers performed renditions of “This is Me” and “Wouldn’t Change a Thing”, both of which featured in ...