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OTRC: Mariah Carey debuts slim figure in Justin Bieber's music video

Justin Bieber and Mariah Carey appear in a still from 'All I Want For Christmas.' (Island Def Jam)

Mariah Carey debuted her newly-slim figure in the music video for her "All I Want For Christmas" duet with Justin Bieber.

The pair, who revealed that they were collaborating together in October, sang Carey's classic Christmas song for Bieber's "Under The Mistletoe" album, which debuted at No. 1 on the U.S. chart and shipped 210,000 units during its opening week following its November 1 release.

The 17-year-old's album contains several traditional Christmas songs, such as "Drummer Boy," featuring rapper Busta Rhymes, his latest single "Mistletoe" and "Fa La La," which features Boyz II Men.

This marks the third time a Bieber album has hit No. 1 on the Billboard 200 Chart. The singer is also the first solo artist to top the chart three times before turning 18 and is the first male singer to have a Christmas album debut at No. 1 on the chart in 55 years, Billboard reported.

Meanwhile, Mariah Carey became the latest Brand Ambassador for the Jenny Craig company and lost 30 pounds since starting its weight loss and diet program in late July, three months after she gave birth to twins.

Carey and husband Nick Cannon, 31, welcomed son and daughter Moroccan and Monroe in April.

Check out the music video for Justin Bieber and Mariah Carey's duet of "All I Want For Christmas" below.

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