Paul Zimmerman/WireImage

WHAT SHE WORE Williams looked flawless in a black-and-cream vintage Geoffrey Beene halter-neck gown, styling it with Fred Leighton jewelry and black Christian Louboutin pumps.
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Allison Williams

Williams looked flawless in a black-and-cream vintage Geoffrey Beene halter-neck gown, styling it with Fred Leighton jewelry and black Christian Louboutin pumps.

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