The 'Diamonds' singer joined a whole host of A-listers at the swanky do, which was held at the Metropolitan Museum of Art in New York.
RiRi hit the style mark in a smoking hot Stella McCartney ensemble, opting for a teeny tiny white crop top which revealed both her toned tum and back.
Her top did, however, also include a high neckline and long sleeves to help keep things on the right side of sexy.
The songstress also sported a white skirt which trailed across the floor as she waltzed down the red carpet, and she accessorised with an eye-popping diamond necklace and heaps of sparkling rings.
Rihanna lacquered her pointed talons a sophisticated mauve shade and opted for pale pink on her lips, teamed with heavily-lined eyes, fluttery lashes and sculpted cheeks.
And she mixed things up on the hair front, piling her long tumbling locks high up on the top of her head to create a messy, dishevelled updo.
We're just surprised she managed to keep her pins under wraps for a whole evening - she normally loves showing them off!
More dresses from the Met Ball 2014:
Copyright: WENN Andres Otero
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