Billy Farrell/BFAnyc/Sipa

WHAT SHE WORE Sienna Miller arrived for The Ever Changing Face of Beauty's opening ceremony in a Boss Black halter gown, tiered necklaces, a box clutch and wide bangle.

WHY WE LOVE IT The mom-to-be set off her sleek column with bronze accessories and her natural glow.

CELEBRITY: Sienna Miller

TREND: Black

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Sienna Miller

Sienna Miller in Boss Black