Mary Kate Olsen Mary Kate Olsen

Mary-Kate Olsen turned heads at the Council of Fashion Designers of America Awards Monday with her new darker 'do.

The former child star and natural blonde surprised everyone when she arrived at the red carpet in New York City sporting freshly dyed brunette locks.

It's been a big week for the famous twin. Not only did she and her sister Ashley Olsen beat out such designers as Marc Jacobs to win the Womenswear Designer of the Year Award, but Olsen recently went public with her relationship with Olivier Sarkozy. The younger brother of the former French president is 17 years older than Olsen, 25.

Mary-Kate Olsen reportedly dating former French president's brother

Olsen, who rose to fame on Full House, had her last major television role as Tara Lindman on Weeds in 2007. The actress has since focused on her fashion career.