Mary-Kate Olsen Dyes Her Hair Brown!

Mary-Kate Olsen Kevin Mazur/Getty Images for jcpenney; Jamie McCarthy/Getty Images

New beau, new hair!

At the CFDA Awards in NYC on Monday, Mary-Kate Olsen was the center of attention for two reasons; one of them being her new dark hair color!

The natural blonde embraced her fraternal twin bond with her sister Ashley Olsen and debuted a set of rich brunette locks on the evening's red carpet. Dressed in an all-black design from her and Ashley's own label, The Row, the 25-year-old fashion designer also wore Sidney Garber jewelry and Louis Vuitton shoes.

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At the ceremony, the sisters were presented with the Womenswear Designer of the Year Award, beating out popular designers like Marc Jacobs and Proenza Schouler.

Mary-Kate's hair change comes just days after it was confirmed that she is dating former French president Nicolas Sarkozy's younger brother, Olivier Sarkozy.

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"It's true, they're dating, and she's definitely interested in him," the Olsen insider tells Us Weekly about her new romance with the 42-year-old Frenchman. Though Olsen and Sarkozy are 17 years apart, the source says their age differences suits her just fine.

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"MK is constantly complaining about boys not being mature enough for her," the source explains. "She got the kids out of her system. Now being a businesswoman dominates her time, and she is rarely impressed with guys."

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