To celebrate the season finale of The Voice, Christina Aguilera and Lady Gaga performed together for the very first time on Tuesday, Dec. 17, in Universal City, Calif. The long-rumored rivals showed no signs of animosity as they belted out the latter's hit, "Do What U Want," in matching lamé outfits.

The platinum-haired pop stars even swigged champagne during the number, no doubt toasting their newly formed friendship. " More dey just hit on the link to complete

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