VIDEO : Chappelle Will Host Rihanna's Diamond Ball, Kendrick Lamar To Perform

David Chappelle will host Rihanna's annual charity event in September and Kendrick Lamar will perform. The pop star's organization, called The Clara Lionel Foundation, will hold its third Diamond Ball on September 14th at Cipriani Wall Street in New York City. Rihanna said in a statement that she's "thrilled that the incomparable 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.