Rihanna hosted the second annual Clara Lionel Foundation – Diamond Ball yesterday (Dec. 10) at Barker Hanger in Santa Monica, California. The black-tie event was also by comedian Kevin Hart – and also in attendance were Will and Jada Pinkett Smith, Kylie Jenner and her boo Tyga, Zendaya, EJ Johnson and more in their fab outfits! Here’s what they wore.