Nick, Joe, and Kevin Jonas causing chaos across the Pond, playing a free concert Monday to frenzied fans in London.

The Jonas Brothers had just wrapped up an interview at BBC Radio when they decided on the impromptu acoustic jam for the hundreds of Jonas faithful that had camped outside the studio.

The heartbreaking hotties are in the U.K. Promoting their new album, Lines, Vines, and Trying Times.

(Photo: Wenn)

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• Vines