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A photo posted by badgalriri (@badgalriri) on

Rihanna was red-hot is Zac Posen, for her first-ever annual Diamond Ball, in honor of her grandparents and charitable organization, the Clara Lionel Foundation.

A photo posted by badgalriri (@badgalriri) on

A photo posted by badgalriri (@badgalriri) on

A photo posted by badgalriri (@badgalriri) on

The event kicked off with a chic cocktail hour, followed by an hour-long red carpet ceremony, where celebs like Ne-Yo, Big Sean and Kim Kardashian showed their support. RiRi changed into a second Zac Posen gown, before she hit the stage to sing a medley of her top hits.

A photo posted by badgalriri (@badgalriri) on

A photo posted by badgalriri (@badgalriri) on

“Thank you to this spectacular team for donating their time and hard work at the #DiamondBall
@jennnrosales @yusefhairnyc @melzy917 @mylahmorales @kimmiekyees #iLoveYouGuys #Family !!!”

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