Rumors have been circulating that Christina Aguilera and Lady Gaga were feuding, and they put the rumors to rest yesterday on the season finale of The Voice when they performed "Do What You Want" as a duet.

E! News is reporting that 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. "I was really excited because The Voice called and wanted me to perform on the finale and I obviously can't refuse," said Gaga, 27. "It's such an amazing show and I said, 'I'll do it, but I want to know if Christina will do it with me.'"

Aguilera, 33, shared the sentiment. "This is the first time we've ever met," she revealed. "When I heard she wanted to collaborate, I said of course! She's such an innovative artist and a risk taker. And as a fellow female, I have so much respect for that. And I just have to say guys, she's the most down-to-earth real person I've met. So I love you girl, and you deserve everything you've earned."

The "Beautiful" singer was in a rumored feud with Gaga back in 2008, but during a September 2013 Watch What Happens Live appearance, Gaga cleared up the so-called "fight."

"I'm a very big fan of Christina Aguilera," she said. "From the very beginning of when my career started there was all this controversy about the two of us, and I always felt that it was very unfair to her."

Check out the duet below. (Source)