Kevin Hart, Will Smith Attend Rihanna's Star-Studded Diamond Ball!

Rihanna definitely knows how to throw a party, and when that party’s for charity you can count on a highly glamorous affair. That was precisely the case Thursday night in Santa Monica, California at the superstar’s second annual Diamond Ball to raise money for her Clara Lionel Foundation and other charities.

In true “Fashion Icon” form, Rihanna stepped out draped in yards and yards of champagne-hued satin courtesy of Dior Haute Couture. The strapless gown and matching floor-sweeping cape looked amazing on the 27-year-old, who was also dripping in Cartier diamonds.

The black tie event was attended by some of Hollywood’s biggest stars, including Will Smith and his lovely wife Jada Pinkett Smith, Kevin Hart, Zendaya, and Kylie Jenner and her beau, rapper Tyga.

By far the cutest partygoer was Rihanna’s 18-month-old cousin Majesty, who stole the show in her sparkly navy dress and gold Stuart Weitzman shoes.

Here’s a look at all the most stunning stars that attended the ball. Who you think deserves best-dressed honors? Tell us in the comments section below.