Dress du Jour, Cannes Edition: Sienna Miller Is Radiant in Ralph Lauren

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Sienna Miller in Ralph Lauren

Shine on, Sienna.

The Dress: A hand-beaded gold slip dress from Ralph Lauren's fall 2015 collection.

The Wearer: Style star Sienna Miller, who is serving on the jury at this year's festival.

See more Cannes: The Red-Carpet Arrivals

The Event: AmfAR's 22nd annual Cinema Against AIDS gala on Thursday evening.

Why We Dig: Though simple, Miller's shimmering golden slip dress was chic without being over-the-top flashy. The easy, mermaid-style silhouette was not only flattering on the actress' petite frame, but also a refreshing reprieve from the heavy and voluminous gowns that have been gracing the Cannes party scene. A plunging neckline and Miller's soft updo drew attention to her perfectly bronzed cheekbones, defined brows and ruby red lips. Rounding out the effortless ensemble were a pair of Atelier Swarovski drop earrings and an art-deco-inspired box clutch.