Bobby Brown runs through the hits at DJ Cassidy's Birthday Party NYC

DJ Cassidy's Birthday party held at the New York's Public Library Tuesday July 7.
Besides the Bobby Brown performance, Rakim performed as well. Khloe Kardasian, Nas, video director Little X enjoyed the festivities and Jay-Z slipped in later.

Check out the photos:
Getty Images
Wire Image
Film Magic
Patrick McMullan

(video courtesy on Ms Drama TV)