The twin sisters, both 39, were among the guests at W Magazine and Bloomingdale's NYFW event at Eleven Madison Park.
Mary-Kate and Ashley coordinated their looks with oversized scarves in different prints and posed together as they stood alongside the publication's Editor-in-Chief, Sara Moonves.
The sisters also had a matching beauty moment with each of them wearing their hair down and parted in the middle.
Other celebrities in attendance at the NYFW party were Olivia Wilde, Tessa Thompson, Emily Ratajkowski, Gabrielle Union, Dwyane Wade and more.
The New York Minute actresses are rarely photographed in public together, with one of their last known appearances being a stylish sister date in the Big Apple during a February 2024 girls' night out. For the low-key outing, they were also joined by their younger sister, Elizabeth Olsen, 36.
All three Olsens were bundled up in chic dark coats and accessories, with Elizabeth topping off her look with a beanie. They also wore oversize bags on their arms.
"I also really admire the partnership that [Mary-Kate and Ashley] have and don't compete with it, in a way. It's something different," The Assessment actress continued. "It's a really interesting thing to watch. I admire it; it's a different kind of connection."
Elizabeth explained she was just 10 years old when she first became "curious about auditioning," but "realized very quickly it wasn't for me" because she had other interests.
"But during that time, I thought, 'I don't want to be associated with [Mary-Kate and Ashley],' for some reason," she continued. "I guess I understood what nepotism was like inherently as a 10-year-old. I don't know if I knew the word, but there is some sort of association of not earning something that I think bothered me at a very young age."
In recent years, however, they have opted out of the spotlight.
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Ashley welcomed her first baby with her husband, Louis Eisner, in August 2023. The couple tied the knot in December 2022 after first being linked in October 2017.
Mary-Kate was romantically linked to former NHL star Sean Avery after the pair were seen in the Hamptons over Memorial Day weekend 2024, in photos published by DeuxMoi. However, a source told PEOPLE they were "just friends."