Since her first annual Diamond Ball last year, Rihanna's black tie charity event has become the fashion equivalent of Christmas. RiRi not only churns out a once-in-a-lifetime look for a good cause, but also invites a slew of stylish stars (ahem, Kylie Jenner and Zendaya) to join her. Here, find all the can't-miss looks from the Barbadian bombshell's big night.
