Justin Bieber performed on the season finale of the US X Factor, which aired last night (December 22). He sang his versions of "The Christmas Song" with Stevie Wonder and "Santa Claus is Coming to Town," and in a special and sweet gesture, Justin called Belieber and contestant Drew Ryniewicz on to the stage. He gave her a big hug and she sang of verse of the song. Check out the videos and more pictures below!

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