Lights, camera, Gaga!

Lady Gaga makes an appearance on "Gossip Girl" Monday night, singing her hit "Bad Romance" for the stars of the show -- and dressing up as the red carpet! Check out "Extra's" exclusive behind-the-scenes look at Lady Gaga's performance.

lady gaga gossip girl

Look back at some of Lady Gaga's wildest outfits -- and vote for your favorite!

"Gossip Girl" airs Mondays at 9 PM on the CW.

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