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Justin Bieber has revealed that Mariah Carey is the special, surprise guest that will appear on his upcoming Christmas album, Under The Mistletoe. What's more, the pair did a remake of her hit "All I Want for Christmas Is You." Bieber tweeted a link to a video message from Mariah, in which she says: "I'm very excited about it. I think a lot of you are already surprised by this and you're going to be even more surprised when you hear it." Other guests on Bieber's Christmas album will include Usher, Boyz II Men, Busta Rhymes and The Band Perry. The first single from Under The Mistletoe, "Mistletoe," drops on October 18, with the album coming on November 1. Tricky Stewart, who produced the album, shared with MTV News the one song he felt needed to make the cut. "For me, I knew I wanted 'Santa Claus Is Coming to Town,'" he said. "That's one of those that makes everyone feel good. So we did it and I think it's a really cool version of it."

Lifetime is planning a biopic on Lady Gaga, titled Fame Monster: The Lady Gaga Story. According to Deadline, the made-for-TV movie would be based on the 2010 book Poker Face: The Rise And Rise Of Lady Gaga. Gaga herself is not involved in the project. The film is being written by Norman Snider (Casino Jack).

The Black Eyed Peas have pulled out of the Michael Jackson tribute concert that will take place in Cardiff, Wales on Saturday. "Due to unavoidable circumstances, the Black Eyed Peas will be unable to perform at this Saturday's Michael Forever event," said Chris Hunt, head of Global Live Events, according to Reuters. "It is with regret that we announce the removal of Black Eyed Peas from the Michael Forever bill, but I look forward to a great night with other earth shattering artists. The event is really getting into gear and is going to be a fantastic evening for all." Other artists on the bill include Jackson's sister La Toya, some of his brothers, Christina Aguilera, Cee Lo Green, Gladys Knight, Smokey Robinson and Leona Lewis, while Beyonce will appear in a video performance.

Producer Tricky Stewart says that Katy Perry is working on leftover songs that didn't make the cut for her smash album Teenage Dream. Stewart told MTV News, "Katy and I went into [the studio] just to address some issues with records that we had done in the past that didn't end up going on Teenage Dream. So we are in the process of just listening and freshening up things and getting ready for something special she has going on." While Stewart didn't say what the songs would be used for, he did disclose one track is titled "Dressing Up."

Gorillaz will release a new best-of set, The Singles Collection: 2001-2011, on November 29 via Virgin Records. The set compiles tracks from the cartoon band's self-titled debut, 2005's Demon Days and last year's Plastic Beach, along with two remixes. The collection will also be available as a CD/DVD set and on vinyl, with an import-only box set of 7" singles.