Sunny blonde hair gives the twins a perfect summer glow.
The Olsen twins add a pop of color to their black and white outfits with patterned and bright colored clutches.
The twins don flowing, angelic dresses on the red carpet.
The twins love to pair starkly contrasting black and white in their outfits.
Black on black on black is the twins' high-fashion motto.
Sunglasses inside? The Olsen twins can get away with breaking any style rule they'd like because they still look fabulous.
The twins haven't stopped matching! Their twin purses are as cute as can be.
The twins have never let go of their most iconic look: flowing loose-fitted dresses.
The twins rock chic black sunglasses to complement their all-black outfits.
Who can wear sunglasses inside and get away with it? Mary-Kate and Ashley can wear sunglasses inside and get away with it.
The twins look more grown up than ever with fully developed and sophisticated personal style.
The twins have lost their indoor sunglasses look, but have returned to their go-to: all-black!
At an Estee Lauder event, sporting bags of their own design.
Posing on the CFDA red carpet, just before winning their awards for Accessories Designers of the year.
Posing in casual attire at the Elizabeth and James fragrance launch event.
Looking ultra-chic in Paris.
Mary-Kate cozies up to fiancee Olivier Sarkozy.
Ashley takes Olivier's usual spot at the game.
Looking regal at the Met Gala.
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Mary-Kate and Ashley Olsen have always held a special place in our hearts. First, for their role as Michelle Tanner on Full House, and now, as full-fledged fashion designers for lines The Row and Elizabeth & James. After their CFDA Awards win last week, and it being their 28th birthday today, we can't help but wax poetic on the twins' style transformation over the years.
Though it's hard to imagine a time when the Olsens weren't in the tabloids for their bold sense of fashion, the dynamic duo, as they are so often referred to, once starred in some of our most beloved children's movies. It Takes Two, anyone? Passport to Paris? Back in the day, the Olsen twins were synonymous with seriously entertaining home video for girls of all ages.
From child stars to fashion icons, the Mary-Kate and Ashley Olsen have come a long way. Click through the gallery to see their full style transformation!