Diane attended this year's Cannes closing ceremony and the premiere of Thérèse Desqueyroux in a wildly voluminous Christian Dior Haute Couture ball gown. The black, white, and gray plaid confection had a structured bodice and was accompanied by a very Victorian-inspired bustle and train. She kept all eyes on the gorgeous gown by keeping her hair and makeup slightly subdued and accessorizing only with a pair of diamond earrings.
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