VIDEO : Dave Chappelle Teaming With Rihanna

Dave-Chappelle/'> Dave Chappelle will host Rihanna's annual charity event in September and Kendrick Lamar will perform. The singer's organization, The Clara Lionel Foundation, will hold its third Diamond Ball on Sept. 14 at Cipriani Wall Street in New York City. Rihanna said in a statement Tuesday she's "thrilled that the incomparable Dave-Chappelle/'> Dave Chappelle will kick things off as the official host" and said Lamar, whom she has collaborated with, "will take the stage for an unforgettable performance.