With the 55th annual Grammy Awards less than a week away, another performance has been confirmed, and it's of the all-star collaboration variety. Bruno Mars will take the stage along with Rihanna and Sting for a special performance, the Grammys announced Feb. 4. The awards show also added Kelly Clarkson to the list, apparently performing in a separate routine. As for the Mars-Rihanna-Sting, collab, no ...
