We The Kings hit the stage at West Hollywood's House of Blues last night on Monday night, and they brought out a very special guest with them — Demi Lovato! She duets with the boys on their Smile Kid album track, "We'll Be A Dream," and she finally go to sing her part live!

But Demi almost didn't make it on stage to sing — sources tell J-14 that at first "a bouncer thought she was some random groupie!" Luckily she mad it on stage and wowed the crowd!

Tons of We The Kings' and Demi's friends were there to check out the L.A. stop of the Take Action Tour, including her sisters Madison De La Garza and Dallas Lovato, Nick Jonas, JONAS' Chelsea Staub, Suite Life On Deck's Debby Ryan, Forever The Sickest Kids' Jonathan Cook, Camp Rock 2's Chloe Bridges, and the boys of Big Time Rush.

Who else do you want Demi to duet with?

Photo: Courtesy of Jonathan Bregel

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