11/07/2013 18:43 BST | Updated 22/05/2015 10:12 BST

Mary Kate Olsen Debuts Sleek Brunette Hairdo At CFDA Awards

At last night's fashion Oscars, the CFDA Awards, Mary Kate Olsen may have just been thinking that brown-haired girls have more fun.

mary kate olsen new brown hair

The actress-turned-designer showed off a new sleek brunette 'do at the awards show, which she attended with her twin sister Ashley Olsen. The duo reached a new high point in their design careers last night and were honoured with the trophy for Womenswear Designer of the Year for their label, The Row.

mary kate olsen

Just last month, Mary Kate stepped out at the Costume Institute Gala with her trademark blonde hair in a wild, wavy updo.

mary kate ashley olsen

Which of Mary Kate's hair looks do you prefer? Blonde and wavy or brunette and smooth?

Leave a comment and let us know and don't miss our gallery of all of the looks from the CFDA Awards last night.