Jimmy Fallon posted video of him leading a singalong of The Killers' "Mr. Brightside" from the stage at the Jonas Brothers' concert in New York City over the weekend.
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"Huge thanks to @jonasbrothers for giving me the surprise guest spot on 'The Tour' tour. And thank you to @yankeestadium for turning it into the world's biggest karaoke party. This is one of those nights I will never forget," Fallon tweeted Sunday night.
New Jersey natives Jonas Brothers played to sold-out crowds at Yankee Stadium Saturday and Sunday.
The shows kicked off their planned 90-date concert tour across 20 countries.
Fallon has been keeping a low profile recently as his late-night talk show, The Tonight Show Starring Jimmy Fallon, is dark due to the ongoing Writers Guild of America strike, which began in May.
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The Screen Actors Guild joined the labor stoppage last month, shutting down most TV and film productions in North America.