Rihanna Rocks Hammerstein Ballroom

Rihanna rocks it out on stage at Hammerstein Ballroom on Thursday night (December 3) in New York City.

Loving the portable mic stand — it even had a brass knuckle attached to the bottom of it!!

The concert, which presented by MySpace, JetBlue and Sprite Green, opened up with “Wait Your Turn” and closed with her smash hit “Umbrella.” Of course during her performance, countless fans opened up their own umbrellas and danced along.

Watch one of her performances below!

20+ pictures inside of Rihanna rocking it out at Hammerstein Ballroom…