They've been nearly inseparable for years, as dual child actresses and later as fashion luminaries.
And Mary-Kate and Ashley Olsen were together once again on Thursday as the twins celebrated their 33rd birthday surrounded by friends and family at a restaurant in New York City.
The sisters stuck with their standard uniform of sleek black, though Mary-Kate opted for casual comfort while Ashley adopted a glamorous look.
Double trouble: Mary-Kate and Ashley Olsen were together on Thursday as the twins celebrated their 33rd birthday surrounded by friends and family at a restaurant in New York City
Princesses for a day: The sisters wore matching birthday tiaras during the celebrations
Ashley, the eldest of the twins by a few minutes, arrived in a jet black thigh-length dress that put her toned legs on full display.
She covered up in a thick camel-colored cashmere overcoat, which she draped over her shoulders.
She elevated her 5ft1in height with a pair of wood brown heels.
The sister of Elizabeth Olsen had her blonde tresses parted down the middle and cascading over her dress.
She spiced up her look with a gold ring display on her left hand.
Timeless elegance: Ashley, the eldest of the twins by a few minutes, arrived in a jet black thigh-length dress that put her toned legs on full display, and she elevated her 5ft1in height with some wood brown heels
Bundled up: She covered up in a thick camel-colored cashmere overcoat, which she draped over her shoulders
Bling bearer: She spiced up her look with a gold ring display on her left hand
Mary-Kate went for a more low-key look with a plain black T-shirt, though she paired it with elegant black slacks.
The 5f2in fashion designer had on a pair of pointy black heels and toted along a thick black handbag.
She was also seen with a Louis Vuitton shopping bag as she stepped out of the car outside the restaurant.
Mary-Kate displayed a gold luxury wristwatch, and later she and her sister wore festive 'Birthday Girl' crowns.
No fuss: Mary-Kate went for a more low-key look with a plain black T-shirt, though she paired it with elegant black slacks
Back in black: The 5f2in fashion designer had on a pair of pointy black heels and toted along a thick black handbag
