At London's Jingle Bell Ball, the guys of One Direction were put the test when they were asked to sing their favorite Christmas song. Member Louis Tomlinson said that "undoubtedly" his favorite Christmas tune is Mariah Carey's "All I Want For Christmas Is You"... which Justin Bieber just did a version of!
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One Direction couldn't resist singing their rendition for the cameras. Check it out:
And here's Justin's version:
Sound Off: Who's version of "All I Want For Christmas Is You" do you like better: One Direction or Justin Bieber?
Photos: Courtesy of Heidi Gutman/ABC; Courtesy of John Urbano/Sony Music