2012 CFDA Fashion Awards: Mary-Kate Olsen Debuts Brunette Hair (PHOTOS)
Debuting a new brunette look, "brunette Mary-Kate Olsen" became a trending topic worldwide on Twitter.
New hair for a new guy?
According to Us Weekly MK, 25, is dating former French president Nicolas Sarkozy's younger brother, Olivier Sarkozy, 42.
What do you think of Mary-Kate's new look? Sound off below!
Plus, get more scoop on Mary-Kate's supposed new romance here: