Justin Bieber and Usher Cover a Christmas Classic

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And the Christmas goodies keep on coming from Justin Bieber.

Usher debuted The Christmas Song (Chestnuts Roasting on an Open Fire) -- a cover he and Justin Bieber recorded -- this morning on Ryan Seacrest's KIIS FM radio show On-Air with Ryan Seacrest. The track comes off the Biebs' upcoming Christmas album Under the Mistletoe, out November 1.

Bieber sounds surprisingly mature in the duet, and it's nice to see mentor and protégé collab on a Christmas classic.

So check out the song that will surely be on blast at every mall this holiday season!

MORE: Justin Bieber's Romantic 'Mistletoe' Music Video