Justin Bieber and Mariah Carey have teamed up to answer a pressing question: What is the only thing these two superstars want for Christmas?!?

Indeed, a few days after Bieber unleashed his duet with Usher (listen to these pals roast chestnuts on an open fire HERE) on an adoring public, the 17-year old icon has done the same for his cover of Carey's holiday classic.

Posted in: Mariah Carey