Kim opted for a black leotard-inspired outfit, with a sparkly see-through overlay and a long black coat while Kris went with a sexy pantsuit, featuring a lace modesty panel covering her cleavage.
The pair also got some face time with the woman of the hour and a photographer captured this candid shot of Kim holding RiRi's hand while Kris looked on with a smile.
The event will benefit Rihanna's Clara Lionel Foundation. The charity, which she formed in 2012 in honor of her grandparents, helsp raise funds to improve the quality of life for communities globally in the areas of health, education, arts, and culture.
Other stars in attendance for this year's inaugural event included Jimmy Kimmell, Salma Hayek, Brad Pitt and Big Sean.
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Gallery | Celebs Doing Good