Julianne Moore
This year's Best Actress nominee has opted for (from left) Tom Ford for Yves Saint Laurent, Atelier Versace and Calvin Klein in the past.
Reese Witherspoon
The Oscar-winner went with (from left) Valentino, vintage Christian Dior and Louis Vuitton.
Marion Cotillard
The year she brought home a golden statue, the French actress glowed in Jean Paul Gaultier and then followed up with a Christian Dior Haute Couture ball gown.
Meryl Streep
Being the most Oscar-nominated woman of all time means Meryl has gone to a lot of Academy Awards. Some of her best red carpet moments at the annual event were thanks to designers (from left) Rogelio Velasco, Alberta Ferretti, Chris March and Lanvin.
Emma Stone
The Birdman actress may have only attended the Oscars once but she made quite the impression in her Giambattista Valli gown.
Laura Dern
Last year the star (in Alberta Ferretti) show up in person to support dad, Bruce Dern.
Keira Knightley
The expecting star wore this unforgettable Vera Wang number at her first (and only, so far) Oscar appearance.
Patricia Arquette
The Boyhood actress attended back-to-back Academy Awards with then-husband Nicolas Cage.