This week, Marion Cotillard graced the red carpet in fiery red, Julia Stegner opted for a sleek '90s approach, and Nicky Hilton gave us sexy head-to-toe black. Let's see how well you were paying attention to the minor, but oh-so-important, details of this week's style stars.

CelebStyle Smarts

Who made the black lace dress Nicky Hilton wore in the Hamptons?

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