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It's a rare event that we get a Mary-Kate and Ashley Olsen public outing, let alone a reunion with their younger sister and Marvel star Elizabeth Olsen. In fact, it can even be easy to forget that the famous siblings are related at all. So, when the sister trio stepped out in New York City together earlier this week, it was a once in a blue moon occurrence.

On Tuesday, the sisters were spotted enjoying a girls' night while all wearing coordinating overcoats and oversized bags (Olsen wardrobe staples). Ashley wore a green trench coat styled with baggy jeans, thick-framed glasses, a scarf, and a black tote bag. For her part, Mary-Kate wore a super long black peacoat, and Elizabeth finished off her look with a beanie and black flared pants.

The sisters also share three other siblings: their brother Trent and half siblings Courtney and Jake from their father David's second marriage.

Mary-Kate and Ashley's last sighting together was in November during which they wore, you guessed it, long coats and matching black purses. Elizabeth can often be seen gracing the red carpet alone or with her husband Robbie Arnett. She even stepped out again this week for the Chanel Watches & Fine Jewelry Flagship Opening on Wednesday. The star wore a gray tweed maxidress with buttons and pocket details.

Ashley and her husband Louis Eisner secretly welcomed a baby boy last year, who they named Otto, according to People. The private couple even kept the pregnancy from "a lot of friends and colleagues," a source previously told Entertainment Tonight. "Only a small circle knew."

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