New Songs: Justin Bieber, 'All I Want For Christmas Is You' & 'Little Drummer Boy'

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Christmas is still like, two months away, but my apartment is obviously already decorated in preparation for the arrival of Under The Mistletoe, Justin Bieber's Christmas album that's out Nov. 1. We've already been treated to Justin's "Mistletoe" video in addition to his totally GORG duet "The Christmas Song" with his BFF/mentor Usher. But the duet we've truly been dying to hear is Justin and Mariah Carey's new spin on her classic "All I Want For Christmas Is You."

Mariah's been super excited about this duet for weeks, and now we can totally see why. While the pair didn't stray too far from the original, the new tune does begin with some seriously dope scatting from both Bieber and Mariah until Carey's booming vocals sing us through the first verse of her iconic hit. Justin tackles the second verse like a pro until the two join forces for a beauteous duet on the bridge. And the real-life sleigh bell sounds are still in tact! (Thank God).

Also, WE'VE HEARD ANOTHER MISTLETOE SONG! BONUS! Justin's collabo with Busta Rhymes is perhaps the most brilliantly unexpected take on a Christmas classic EVER! Justin and Busta legit turned "Little Drummer Boy" into a straight-up club banger rife with synths and Busta's signature superfast verses. Justin raps too (!!!), which basically takes this entire situation to a whole other level -- Justin himself is even obsessed with it. "If you really think about it," said Justin, "It's genius, because it's rapping on a Christmas album." Well, we thought about it too, JB --  yep, GE-NI-US.

+ Listen to Justin Bieber featuring Mariah Carey, "All I Want For Christmas Is You" and Justin Bieber featuring Busta Rhymes, "Little Drummer Boy."