USHER & JUSTIN BIEBER IN THE STUDIO SINGING CHRISTMAS SONGS!

Justin Bieber and Usher fans are getting quite the present this Christmas.
Usher, who discovered the 17-year-old in 2008, sings on "Chestnuts Roasting on an Open Fire" from his forthcoming holiday album, "Under the Mistletoe," which comes out next Tuesday.

In a newly released video, the two superstars are seen in the studio recording their duet.

After Bieber takes the first verse, Usher follows up with another.

The two are then shown working with their producer on what to change on the song.

"It's so sick!" Bieber exclaims at the end.

"Under the Mistletoe" also includes collaborations with Mariah Carey, Busta Rhymes and the band Perry on such holiday classics as "Santa Claus is Coming to Town," "Drummer Boy" and "Silent Night."



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