Watch Miley Cyrus and Mark Ronson perform on Saturday Night Live

Miley Cyrus and Mark Ronson appeared on Saturday Night Live last night to perform two songs, including " (Happy Xmas) War Is Over." During the performance of their cover of the John Lennon and Yoko Ono single, the pair were joined on stage by Sean Ono Lennon.

Cyrus and Ronson also sang their single "Nothing Breaks Like a Heart" during the show.

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