(Cover) - EN Showbiz - Justin Bieber says rapping on a Christmas album is "genius".

The Canadian singer is releasing a festive record this year called Under the Mistletoe. Justin has secured a host of big names for the album including Usher, Mariah Carey and Boyz II Men. The 17-year-old is particularly pleased that Busta Rhymes agreed to appear on his version of Little Drummer Boy.

"If you really think about it, it's genius, because it's rapping on a Christmas album... and, like, I'm rapping on it. And then it's singing," Justin told MTV News. "It's cool. [Busta's] got, like, a percussive voice to him [and] the beat was so crazy. I'm actually playing drums on that song, playing the snare."

Justin has teamed up with Mariah on a new rendition of her seasonal classic, All I Want for Christmas Is You.

The teen heartthrob was thrilled to duet with the singing superstar and has revealed how the collaboration came about.

"Mariah Carey is doing it with me! It's incredible," he said. "We wanted Mariah from the beginning, but we kind of thought it was really hard, so we didn't really push the idea. But she's on my label, so we reached out to some people, she got in contact with us, and Randy Jackson was actually at the studio with us, and I was like, 'Yo, you think you can help get Mariah on the Christmas album?' And he was like, 'I'm actually going to see her in New York on Monday.'"

Justin premiered the music promo for Mistletoe, the first single from the new album, earlier this week. (C) Cover Media