Radar Entertainment Editor
The 25-year-old pint-sized star debuted a brand new dark hair-do on Monday night, and RadarOnline.com has the photos of her daring new look.
Mary-Kate showed off her newly brunette locks at the 2012 CFDA Fashion Awards at Alice Tully Hall in New York City, which accentuates her green eyes. She was wearing a dress from The Row, her label with her twin sister Ashley Olsen, and the sisters were the recipients of the Womenswear Designer of the Year Award.
With her new brown hair Mary-Kate is looking much more sophisticated, perhaps an effort to look closer in age to her boyfriend who is 17 years her senior!
What do you think of her new hair color? Tell us in comments below!