The event, launched in honour of her grandparents, benefits The Clara Lionel Foundation, which Rihanna founded in 2012. The foundation works to improve the quality of life for communities globally in the areas of health, education, arts, and culture.
FYI: Rihanna was rocking a Zac Posen dress paired with Chopard jewels. She performed some of her biggest hits, while backed by a full orchestra.
Brad Pitt also introduced Rihanna's performance at her Inaugural Diamond Ball 2014: