She accessorized the look, which features a high-neck and sheer sleeves, with a series of chain-inspired headbands, gold strappy sandals, a black clutch, and thick black eyeliner.
At this point, it's unclear who the designers of the dress or any of Beatrice's accessories are, but we'll be sure to update as soon as we know more.
This evening's event is hosted by Amal Clooney, Rihanna, and Donatella Versace, and centers around the Metropolitan Museum of Art's new exhibit Heavenly Bodies: Fashion & The Catholic Imagination. Beatrice's appearance is the latest in a long tradition of royals attending the Costume Institute fundraiser. Her late aunt Princess Diana attended in 1996 and wore Versace. In recent years, royal attendees have included Princess Maria-Olympia of Greece, Charlotte Casiraghi, and Queen Rania of Jordan. This is Princess Beatrice's first time at the iconic event.
While Beatrice lives in New York City, we'll see her in just a few weeks in Windsor for her cousin Prince Harry's wedding. We can only hope she wears a fascinator as iconic as the one she sported at Prince William and Kate Middleton's nuptials back in 2011.
This is also a busy time for Beatrice's branch of the royal family. Her sister Eugenie is getting married at Windsor later this year, and just moved in with her fiancé Jack Brooksbank next door to Prince Harry in Kensington Palace.
This story originally appeared on Townandcountrymag.com.
* Minor edits have been made by the Townandcountry.ph editors.