It's Chestnuts Monday! Justin Bieber and his mentor Usher released their new Christmas duet, "The Christmas Song (Chestnuts Roasting On an Open Fire)," today on On Air With Ryan Seacrest.

You may still be trying to figure out your Halloween costume, but The Biebs wants you to start getting into the Christmas spirit instead.

Usher called Ryan Seacrest this morning on his show to premiere his new duet with the 17-year-old star from his upcoming Christmas album, Under the Mistletoe.

"Justin and I did the classic record 'Chestnuts Roasting On An Open Fire.' This record is going to be remembered for years to come," Usher said. "It's a recod that has always been one of my favorites, and I'm happy that I was able to share it with Justin, and for us to put it out. The album is full of surprises, Justin's 'Under The Mistletoe' is going to be incredible!"

Under The Mistletoe will hit stores Nov. 1!

Listen to the new duet, below! What do you think?

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