Mary-Kate and Ashley Olsen are 31. (Don’t worry, it makes us feel old too). In honour of their birthday, we look back at their beauty evolution.

Mary Kate and Ashley’s beauty evolution

Where: The Anna and the King movie premiere in 1999
Why we love it: Matching flipped-out hair is #TBT worthy.

 

Mary Kate and Ashley’s beauty evolution.

Where: 2001’s Rush Hour 2 premiere
Why we love it: Straight hair with chunky highlights is aughties glam at its finest.

 

Mary Kate and Ashley’s beauty evolution

Where: Vanity Fair’s Annual Oscar party in 2002
Why we love it: No more matchy matchy! Ashley ops for soon-to-be signature waves, while Mary-Kate sticks with pin straight. A nude lip finishes the look.

 

Mary Kate and Ashley’s beauty evolution

Where: Opening of Fox Sports Grill in 2003
Why we love it: Mary-Kate may regret that hat, but a pink lip is always in style.

 

Mary Kate and Ashley’s beauty evolution

Where: The 2003 MTV Video Music Awards
Why we love it: We’re sweet on this honey-blond hue.

 

Mary Kate and Ashley’s beauty evolution

Where: The premiere of their 2004 movie New York Minute
Why we love it: Olsen twins who? Ashley and Mary-Kate’s once-identical beauty looks start to diverge even more.

 

Mary Kate and Ashley’s beauty evolution

Where: The 2004 MTV Video Music Awards
Why we love it: Team blond or team brunette? We can’t pick. Can you?

 

Mary Kate and Ashley’s beauty evolution

Where: New York City’s Ace Gala Awards in November 2005
Why we love it: Looks like the sisters got matching spray tans. The bronze glow really brings out their gorgeous eyes.

 

Mary Kate and Ashley’s beauty evolution

Where: The Met Gala in 2005
Why we love it: The twins go boho to celebrate Chanel at the Met Gala.

 

Mary Kate and Ashley’s beauty evolution

Where: Front row at Olympus Fashion Week in 2005
Why we love it: With messy hair and minimal makeup, these future fashion designers look like laid-back students.

 

Mary Kate and Ashley’s beauty evolution

Where: The 2007 Golden Globes after-party
Why we love it: World, meet MK and Ashley 2.0. This marked their transformation into the grunge glam beauty icons we know today.

 

Mary Kate and Ashley’s beauty evolution

Where: Farce of the Penguins release party in 2007
Why we love it: Matching outfits is bad. But matching red lips? Always a do.

 

Mary Kate and Ashley’s beauty evolution

Where: The 2008 launch of their clothing line Elizabeth and James in London
Why we love it: Back to their signature blond hair.

 

Mary Kate and Ashley’s beauty evolution

Where: The Museum of Modern Art’s 2009 film benefit honouring Tim Burton
Why we love it: Sorry, Ashley, but Mary-Kate is slaying with this bold lip.

 

Mary Kate and Ashley’s beauty evolution

Where: The launch of Marktbeauty.com in 2010
Why we love it: Blowout goals.

 

Mary Kate and Ashley’s beauty evolution

Where: In New York City at the 2014 World of Children Awards
Why we love it: The MK and Ashley we know and love.

 

Mary Kate and Ashley’s beauty evolution

Where: The 2015 CFDA Awards
Why we love it: Centre parts take centre stage with this red-carpet look.

 

Mary Kate and Ashley’s beauty evolution

Where: The Met Gala in 2016
Why we love it: Behold, the modern-day Olsen: bed-head, neutral makeup and so much smoulder.