Cee Lo Green, Mariah Carey to perform on NBC’s "Christmas in Rockefeller Center"

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Carey accepts the 2012 Icon Award at BMI?s annual Urban Music Awards at the Saban theatre in Beverly HillsLOS ANGELES (TheWrap.com) – "American Idol" and "The Voice" might be rivals in the singing-competition arena, but the two shows will come together – sort of – for the Christmas season. "Voice" coach Cee Lo Green and Mariah Carey – who begins her stint as an "American Idol" judge when the show returns in January – will both be on hand to perform on NBC's 15th Annual "Christmas in Rockefeller Center," the annual celebration of the lighting of the Christmas tree in New York's Rockefeller Center. …

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