Rihanna Goes "Off the Wall"

Rihanna celebrates singer pal Chris Brown‘s “Off the Wall” 18th birthday party at the 40/40 club on Sunday in New York City.

The 19-year-old Barbados babe was accompanied by Los Angeles Clippers point guard Shaun Livingston, 22.

10+ pictures inside of Rihanna @ Chris Brown‘s b-day bash…