Rihanna held her 4th annual Diamond Ball at New York City's Cipriani Wall Street on Sept. 13, 2018, and her famous friends and celeb supporters came out in droves to support her. The gala benefits the Clara Lionel Foundation, and for the A-list function, stars certainly brought their fashion A-games. Click through the gallery to see some of the best looks and biggest names amongst the glamorous bunch.
