NBC is unleashing the star power for its finale of season three of The Voice this Tuesday.  Rihanna , Kelly Clarkson and Bruno Mars are all set to perform on the show.

Rihanna will perform her hit "Diamonds" during the two-hour show, while Kelly will sing her latest, "Catch My Breath," from her new greatest hits album.  Bruno, meanwhile, will debut a new song, "When I Was Your Man," from his album Unorthodox Jukebox .  The alt-rock band The Killers will round out the evening's entertainment lineup.

During the show, either pop rocker Cassadee Pope , blue-eyed soul man Nicholas David or Scottish rocker Terry McDermott will be named the winner of The Voice.

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