Naughty or Nice? Mariah Carey Flirts Her Way Through Justin Bieber's 'All I Want' Video

Justin Bieber Hangs 'Mistletoe' Atop Holiday Songs Chart

Now that the holiday season is officially upon us, Mariah Carey and Justin Bieber have unveiled their flirtatious video for "All I Want For Christmas Is You," a reworked duet of Carey's Christmas classic that appears on Bieber's "Under the Mistletoe."

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Although the Biebs tops Mariah's holiday wishlist, she may be a little too naughty in the clip to get on Santa's good side. Justin looks all grown-up and Mariah has definitely noticed, getting friendly with the underage teen star in a sleigh after Bieber checks her out at the mall -- a teen girl fantasty if we've ever seen one. And of course, Mariah rocks a skimpy Santa get-up and looks great doing it, just months after giving birth to twins. Watch below.

Video: Mariah Carey & Justin Bieber, "All I Want For Christmas Is You"

In the video, Bieber and Carey trade verses in a mall while Bieber buys gifts for a giveaway in the charitable holiday spirit. As Bieber adds his usual charismatic popstar swag, stomping around a tiny circular stage and throwing down inappropriately aggressive hand motions in a Macy's, Carey focuses her efforts in a similarly inappropriate fashion, suggestively flirting with Bieber. However, despite the sexual overtones, the video also depicts many holiday shoppers elated with festive cheer, struck with the genuine generosity and joy that only comes once a year, and ends with Mariah and Justin distributing gifts to beaming fans. There's even a puppy involved, in an attempt to multiply the warm and fuzzy factor (spoiler: it worked).

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"All I Want For Christmas Is You" follows "Mistletoe," "Santa Clause Is Coming To Town" and "Fa La La" (feat. Boyz II Men) as the fourth video off Bieber's holiday album, "Under the Mistletoe." Keeping on the holiday train, he's set to appear on the holiday special "Christmas in Washington," which will air on Dec. 16, and he will also perform on "Dick Clark's New Year's Rockin' Eve."