VIDEO: Justin Bieber and Mariah Carey engage in some creepy Christmas flirtation (and product placement)

It’s December, which means increased spending, seasonal coffees (some Irish) and carols to tide us over until spring. To get us even more into the holiday spirit (or to encourage us to retreat to the woods), Justin Bieber and Mariah Carey have teamed up to sing Carey’s “All I Want for Christmas Is You” for a holiday Macy’s ad music video. The tune is catchy as always (Carey’s carol is still one of the best), but we can’t help but feel a little weirded out. All Carey seems to want for Christmas is, er, the Biebz: the 41-year-old strokes her body and presents herself against a wall with her rump in the air, while the 17-year-old Bieber ogles Carey in her skimpy décolletage-revealing outfit. Not to be crass, but she looks visibly excited at the prospect of mistletoe, and the two end up in a sleigh together (we’re not so sure the addition of a puppy makes it seem less perverse). The only thing that tears Bieber away from his latest cougar conquest (and thank goodness) is a Nintendo 3DS, which gets almost as much screen time as Carey’s backside.