The Insider.com

While the Olsen twins are now more primarily known for their impressive fashion empire and unconventional style, they also have a distinct look -- big eyes, super-petite and blond hair (or as Jamie Kennedy once referred to them on a memorable episode of Cribs, "baby Cameron Diaz's").

• June 05, 2012Fashion's Elite Grace the CFDA Awards
• June 05, 2012Inside The 'PLL' Wardrobe Closet
• June 05, 2012Ellie Kemper Fashion Time Warp
• June 04, 2012Trend Spotting: Summer Suits
• June 04, 2012Rihanna's Neon Nails: Sassy or Scary?
• June 04, 2012Kate Middleton and Kim K In the Same Dress?!

But Mary-Kate Olsen recently decided to drastically change it up, dying her hair completely dark brown.

Related: Mary-Kate's Beau Old Enough To Be Her Dad?

MK debuted the new look at last night's 2012 CFDA Fashion Awards in New York City, sporting a super-straight hairdo and tucking her hair behind her ears to show off a pair of heavy drop earrings you just know cost more than your car.

The new 'do makes her look a little more mature, no?

... Perhaps it has something to do with her rumored new boyfriend, Olivier Sarkozy, who's 17 years her senior?

Related: The Olsen Twins Get Called a 'Pain in the Ass'

Whatever the inspiration, I'll take it. Anything has to be better than those electrocuted blond tendrils she was sporting at her last public appearance.