Nicole Richie is giving Miley Cyrus a run for her money! The 31-year-old Fashion Star mentor arrived at the 2013 Costume Institute Gala sporting a new dye job.

Sticking to the "Punk: Chaos to Couture" theme, Richie rocked gray-blue hair styled in a short updo on the red carpet at the Metropolitan Museum of Art in NYC on Monday, May 6.

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The stylish mom to daughter Harlow, 5, and son Sparrow, 3, wore a long white embellished Topshop dress that showed off her slim figure. Richie accessorized her look with dark lipstick and spiky earrings.

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Before hitting the Met Gala, Richie teased on Instagram that she would be dyeing her hair. "Hair time Met Ball," she captioned a shot of hair color.

Click here to view the live stream (+ archived version) of the 2013 Met Gala on

PHOTOS: Nicole Richie's style transformation

Tell Us: Do you like Richie's gray-blue hair?

This article originally appeared on Nicole Richie Rocks Short Gray-Blue Hair, Long White Topshop Dress at Met Gala 2013