Watch Ariana Grande Cover a Britney Spears Classic in an Epic Face-Off With Kelly Clarkson

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Ariana Grande and Kelly Clarkson are used to facing off on NBC's The Voice. But recently, both singers took part in a friendly competition against each other with fellow The Voice judges Blake Shelton (Clarkson's team) and John Legend (Grande's team) during the premiere episode of Jimmy Fallon's new variety game show, That's My Jam. During Monday's episode, Grande and Clarkson went mic to mic in a Mixtape Medley showdown, in which they sang a medley of classic hits we all know and love. The catch? The songs were given to them at random, so they had no idea what was coming next and had to keep up with the lyrics! Unsurprisingly, the Grammy-winning singers put up a tough fight.

Grande covered songs like Britney Spears's "Oops!... I Did It Again," Cher's "Believe," Whitney Houston's "How Will I Know," and Celine Dion's "It's All Coming Back to Me Now," while Clarkson nailed Shania Twain's "Any Man of Mine," Alanis Morissette's "You Oughta Know," and Toni Braxton's "Un-Break My Heart." At one point, Fallon even interjected to exclaim, "These guys can sing!" Ultimately, The Tonight Show host crowned Clarkson the champion. But, we still think they're both winners. Watch the video above!

That's My Jam is inspired by some of the fun games Fallon plays with his guests on The Tonight Show and pits two teams of two celebrities against each other to compete for a charity of their choice.