It wouldn't be a Rihanna Instagram pic if she had her top on! The topless star got frisky with her entourage backstage at her inaugural Diamond Ball that was held last week.

Wearing a voluminous Midnight Blue Duchesse and Taffeta Strapless Ball Gown from the Zac Posen Resort 2015 collection, the 26-year-old is pictured seating in the middle of her posse, smoking a cigar and being the bad gal we all know and love!

The first annual Diamond Ball was a charity event, raising money for Rihanna's Clara Lionel Foundation, which was founded in 2012 in honor of her grandparents, Clara and Lionel Braithwaite.