See Every Olsen Twin Met Gala Look (Spoiler: They're All Amazing)
2005: THE HOUSE OF CHANEL
It was a British invasion on the red carpet at the 2006 Met Gala – which may explain why the twins went for a more prim and proper fitted look than their go-to "bag lady chic" NYU attire at the time.
2007: POIRET: KING OF FASHION
The year after establishing their design cred with The Row, the sisters started showing signs of their signature design aesthetic in dresses that mirrored one another: classic color palettes, streamlined shapes and those long, loose Olsen waves.
2008: SUPERHEROES: FASHION AND FANTASY
For the superhero-themed year at the Met Gala, Ashley's superpower seemed to be reading our mind (We're thinking: 'We're jealous of your brow game') and Mary-Kate appeared to be able to make her eyebrows disappear.
2009: THE MODEL AS MUSE
The night was all about inspiring female supermodels, but Mary-Kate and Ashley seemed to be concerned with eye candy of a different kind (pictured with Josh Hartnett, left, and then-boyfriend Justin Bartha, right).
2011: ALEXANDER MCQUEEN: SAVAGE BEAUTY
Neither twin wore Alexander McQueen, but both chose vintage gowns that had the designer's sense of drama: Ashley wore vintage Christian Dior, while Mary-Kate chose a boho-feeling Givenchy Couture gown.
2012: SCHIAPARELLI AND PRADA: IMPOSSIBLE CONVERSATIONS
Schiaparelli's signature color was hot pink ... which didn't seem to be a huge factor in Mary-Kate's dressing decisions the year she attended solo in a gown of her own design.
2013: PUNK: CHAOS TO COUTURE
The emphasis was on the "chaos" part of the theme, as both sisters picked voluminous ensembles in coordinating citrus shades with tons of embellishment.
2014: CHARLES JAMES: BEYOND FASHION
The Olsens paid tribute to the designer's classic '50s silhouette with more vintage gowns (that had us divided) – an '80s-inspired Chanel look from Ashley and a Gianfranco Ferré business-suit-esque number from Mary-Kate.
2015: CHINA: THROUGH THE LOOKING GLASS
Themes are for amateurs! The Olsens did their own thing at the event, wearing coordinating black gowns – Mary-Kate in a robe-style shearling-trimmed number and Ashley in a tiered and puff-sleeved look (both are in David Webb jewels).
2016: MANUS X MACHINA
Their participation on for the tech-themed red carpet was notable for two reasons: The first, they wore different colors; the second, they displayed a hint of a smile in the photobooth.
2017: Rei Kawakubo/Comme des Garçons: Art Of The In-Between
The sisters both chose heavily accessorized lace dresses for the carpet, with Ashley topping hers off with an embroidered, feather-accented jacket.
2018: Heavenly Bodies: Fashion and the Catholic Imagination
From the floaty caftan-style dresses to the iridescent statement jewelry (by Stephen Russell) to the loose waves, there weren't a lot of surprises in the designers' looks - which is just how we like their Met Gala appearances.
2019: Camp: Notes on Fashion
The stars donned complementary long leather gown/jacket hybrids with their signature boho waves and understated clutches. Is it camp? Who cares!