Kanye West showed up unexpectedly at the New Yorkers For Children 8th annual “Wrap To Rap” charity event yesterday.

However, don't expect a traditional tune with jingle bells - Rihanna personalized the song by adding a reggae flavor.

Jingling sleigh bells, a piano medley, and a plea to Santa open the upbeat, festive track, produced by Jermaine Dupri and Bryan-Michael Cox.

The new cover is festive and pictures Carey seated in snow (again), in the same innocent pose, rocking the same Santa-like one-piece.