"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.
Rod Stewart, Trace Adkins, Victoria Justice, former "Voice" competitor Chris Mann and Italian pop-opera (or popera, if you wish) trio Il Volo will also perform on the special, which airs Nov. 28 at 8 p.m.
In addition to the musical talent, Billy Crystal and Bette Midler will make special appearances on the special.
"Today" co-host Savannah Guthrie and the show's weatherman Al Roker will co-host the special.