Mary-Kate Olsen, Ashley Olsen, Birthday

Feeling old yet? Twins Mary-Kate Olsen and Ashley Olsen turned 33 on Thursday.

The former Full House actresses and child stars-turned-fashion moguls celebrated their big day together at a small dinner in New York City with friends and their significant others—Ashley's artist boyfriend Louis Eisner, 30, and Mary-Kate's husband Olivier Sarkozy, 50, who was accompanied by his teenage daughter Margot, one of his two kids from a previous marriage.

The sisters wore matching tiaras that read "Birthday Girl." Mary-Kate stepped out in a black T-shirt, matching pants and heels, while Ashley wore a brown coat over a black dress and heels.

A source told E! News that the twins started off their birthday celebration at the Harry Cipriani restaurant at the Sherry-Netherland Hotel overlooking Central Park. They headed to Ashley's apartment for an hour and then joined their group for dinner at the Greek restaurant Milos.

Ashley Olsen, Louis Eisner, Birthday

This marked a rare public spotting of Mary-Kate and Ashley, who are notoriously private.

Mary-Kate Olsen, Olivier Sarkozy, Birthday

However, they do regularly attend the annual Met Gala and the CFDA Fashion Awards each spring.

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