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 .

On Sunday, Demi Lovato joined the Jonas Brothers on stage in New Jersey for the opening night of the JONAS20 tour, dazzling in statement-making rhinestone-covered jeans. For the “Camp Rock” reunion, Lovato, 32, slipped into a pair of slouchy crystal-adorned Acne Studios jeans ($1,400).

Demi Lovato wouldn't change a thing about her recent reunion with the Jonas Brothers. In an episode of Chicks in the Office posted Tuesday (Aug. 12) - two days after the pop star made a cameo at the Jo Bros' kickoff 20th anniversary tour concert in New Jersey - Lovato opened up about how "healing" it was to perform Camp Rock hits "This Is Me" and "Wouldn't Change a Thing" with former costars Joe,