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The stars were shining bright like diamonds Thursday night at The Vineyard in Beverly Hills!

Rihanna's First Annual Diamond Ball, a black-tie fundraising gala benefitting the Clara Lionel Foundation (CLF), attracted a host of celebrities and guests, including Kim Kardashian, Brad Pitt, Kris Jenner, Salma Hayek, Adrienne Bailon, Tyrese Gibson, Nikki Reed and more!

The lady of the night looked flawless in a gorgeous pink Zac Posen gown. Another woman who captured my eye: "Vampire Diaries" star Kat Graham, who rocked a sultry plum Pamella Roland gown with a plunging deep-V neckline. These two ladies were elegance + sexiness personified!

Check out the photos above to see the other stunning looks from the red carpet and inside the event.

About CLF:
CLF's grants fund efforts promoting health, education, arts and culture globally. What began with a heartfelt, personal donation from Rihanna has transformed into a comprehensive effort to deliver quality treatment for cancer patients in Barbados. Rihanna witnessed first-hand the inefficiencies and great need for development in the healthcare system during her grandmother’s battle with the disease. To date Rihanna has personally donated funds to establish the existing Clara Brathwaite Center for Oncology and Nuclear Medicine and purchased the facility’s first modern radiotherapy machine, the Equinox Beam.