LMFAO Joins YouTube Star Keenan Cahill Backstage (and Onstage) at AMAs!

Sixteen-year-old YouTube lip-syncher Keenan Cahill may have made a name for himself last year for his hilarious “cover” of Katy Perry’s hit song Teenage Dream, but the young star is starting to get some pretty big connections in the music world! Since then, he’s performed with Katy, 50 Cent, DJ Pauly D, and Darren Criss  to name a few! And ever since Keenan jammed with LMFAO at Tao in Las Vegas last Memorial Day weekend, they’ve stayed great friends! 

The proof is in this pic of the outrageous group and Keenan backstage at the 2011 American Music Awards on Sunday night!

The “Party Rock Anthem” musicians took some time to hang out with Keenan at the AMA’s, before the Internet sensation actually joined them onstage for their awesome performance of “Sexy And I Know It”!

LMFAO took to their twitter account to retweet about the closing performance of the show, writing:

“#PartyRocking RT @VKCR1 @DavidHasselhoff @justinbieber @keeanCahill doing the wiggle with @LMFAO on the @officialamas! Great show!”

Keenan tweeted about the star-studded event as well, saying:

“@KeenanCahill Loved the @OfficialAMAs definitely wanna come back next year :)”

Which was your favorite celebrity cameo during LMFAO’s set: Keenan, Justin Bieber or David Hasselhoff? Let us know in the comments below!