On August 10, the Jonas Brothers kicked off their 20th anniversary tour at MetLife Stadium in New Jersey and brought out Demi Lovato as a surprise guest.

Clips from the "Camp Rock" movies played on the jumbotron before Joe Jonas introduced Lovato to the stage.

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She joined the band for a "Camp Rock" medley performance that kicked off with “This Is Me.”

Joe mentioned that they hadn’t played that song in “almost 10 years,” to which Lovato responded, “It might have been longer... crazy!”

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Joe and Lovato also performed a duet of “Wouldn’t Change a Thing,” which appeared in the sequel, "Camp Rock 2: The Final Jam."

He later posted a clip of them lip-syncing to the song on Instagram . One fan spoke for all of us when they commented, “On behalf of zillennials every

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