We’ve come to know the Met Gala as the biggest night in fashion. Entertainers, models, and industry insiders alike bring their style A-game to the steps of the legendary Metropolitan Museum of Art for the most-awaited red carpet of the year.

This year, the exhibition theme honors “Costume Art,” and to match, the dress code is “Fashion Is Art.” While the guest list and looks are under wraps until the very moment the stars hit the red carpet, if there’s anything we’ve learned from watching the Met Gala evolve over the years, it’s to always expect the unexpected.

What happens at the Gala (and sometimes the after-parties) that keeps the Internet talking for days, months, and years to come. Throughout the years, the star-studded event has been the site of many unforgettable, wild, and iconic moments — from the arrival of Princess Diana in 1996 following the divorce from Prince Charles to Rihanna’s unforgettable yellow gown.

Here, we look back at some of the most memorable moments in Met Gala history.