03/14/2011 at 01:00 AM EDT
The Best Supporting Actress nominee-who helped design her one-of-a-kind dress!-was inspired by ballerinas.
in Elie Saab Haute Couture
"The lavender dress was her first choice," says her makeup artist Tracey Levy. "It was bold but classic."
in Calvin Klein Collection
The actress party-hopped alongside husband Hugh Dancy in a sophisticated low-cut dress.
in Naeem Khan
The four-time nominee showed the starlets how it's done: She was the last celeb standing at the Governors Ball.
in Vivienne Westwood
The red carpet vet got dressed in an hour and a half. Her usual prep time? "Twenty minutes." Don't brag, Helen.