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2000

Wondering what inspired your first flippy bob? You can thank the Olsen sisters (circa age 14) for that.

2002

But once they grew out their hair, caramel highlights and pin-straight strands were their go-to style.

2003

In true Mary-Kate-and-Ashley fashion, they pioneered undone beachy waves long before they were a “thing.”

2004

And then they switched things up: Mary-Kate took her strawberry strands to a dark auburn shade and Ashley cut bangs.

2005

Curls? Sure! They tried that look as well — taking their natural texture up a few notches with this bouncy style.

2006

And before we knew it, the road to Mary-Kate's boho beauty transformation began with longer — and lighter — locks.

2006

While Ashley went for a major change of her own with this chocolate brown hue.

2007

Their different lock looks didn't last for long: They teamed up to simultaneously revert back to a bright blonde shade …

2007

… which wasn't light enough for Mary-Kate, who went platinum soon after.

2008

Of course, their hair had to match again eventually — so they both went for the same golden hue.

2009

And they continued twinning with a lighter blonde look, complete with equally grown-out roots

2010

Six years ago, the sisters' go-to locks were locked in: They decided on these loose waves and never looked back.

2011

(Aside for a few rogue occasions when they gave slicked styles a try.)

2012

They then went blonder …

2012

But that was short-lived; Mary-Kate reverted to her chestnut locks for a bit.

2013

The next year, she lightened up – even taking the “hun” for a spin before it became a trend.

2014

But the sisters returned to center-parted low buns as part of their signature red carpet hairstyles.

2015

There it is: their natural shade! The sisters grew out their roots to reveal a color we hadn't seen since 1999.

2016

At 30, Mary-Kate and Ashley embrace their natural texture and the dirty blonde color of our dreams.

2017

And now, here we are: Ashley's hair is a bright shade of blonde, while Mary Kate's natural brunette hue fades into a lighter golden shade towards her ends.

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