Nick Harvey/WireImage

WHAT SHE WOREThe British star chose a dramatically pretty Marchesa gown and a pair of sparkling Chopard earrings for The 12th Annual White Tie and Tiara Ball to benefit Elton John AIDS Foundation in Association with Chopard in Windsor, England.

CELEBRITY: Kate Beckinsale

DESIGNER: Marchesa

TREND: Black

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Kate Beckinsale

Kate Beckinsale in Marchesa