As co-host of the year’s most stylish event, it was her chance to shine.
And Brit actress Carey Mulligan positively sparkled on Monday night as she graced the red carpet in a Prada dress adorned with thousands of gold pailettes.
But the Oscar-nominated star had competition in the glittering gown stakes at the Costume Institute Gala in New York.
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Karolina Kurkova showed off her incredible supermodel physique in a show-stopping Rachel Zoe dress that sparkled from head to toe.
And Jessica Alba channelled Grecian goddess in gold Michael Kors that fell in beautiful pleats from the empire line waist.
Sofia Vergara, meanwhile, opted for silver in a Marchesa lace column dress.
The modest Modern Family star revealed on the red carpet that her body shape requires her to pay careful attention when choosing a dress.
"I always have to do a few tricks here and there because of my body... These dresses are made for models,” she said.