Some of the biggest names in music performed last night at the Z100 Jingle Ball Concert in New York City. Taking style tips from Beyonce & Jay-Z before they officially announced their coupledom, Rihanna and Chris Brown got hot on the Madison Square Garden stage. High School Musical star Ashley Tisdale hosted with Nick Lachey, and other performers included Ne-Yo, Katy Perry, Brandy, Lady GaGa and Jesse McCartney. Enjoy the pics of the big night:

[images: WENN]