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The first Monday in May looked different this year, as the annual Met Gala has been postponed to September due to the COVID-19 pandemic.

This year, the Met Gala will focus on the theme of “In America: A Lexicon of Fashion,” which will take a deep dive into the history of American fashion. The event will be held in a smaller setting on Sept. 13 — pending government guidelines for social gatherings this fall — and will be co-chaired by Timothée Chalamet, Amanda Gorman, Billie Eilish and Naomi Osaka. The event will coincide with New York Fashion Week, which will run from Sept. 8 to Sept. 12.

It’s been two years since celebrities have graced the steps of the Met with their high-fashion looks, with stars like Rihanna, Lady Gaga, Blake Lively, Jennifer Lopez and others regularly leaving their mark on the Met Gala red carpet.

Rihanna has arguably been the most-watched style star at the Met Gala year after year. Some of her most iconic looks include her custom yellow Guo Pei dress at the 2015 Met Gala celebrating the exhibit “China: Through the Looking Glass” and her avant-garde Comme des Garçons look at the 2017 Met Gala celebrating the exhibit “Rei Kawakubo: Art of the In-Between.”

Her most iconic Met Gala look, however, came in 2018 when Rihanna took the theme of “Heavenly Bodies: Fashion and the Catholic Imagination” head on by dressing in a custom Maison Margiela Pope-inspired dress and hat.

Here, WWD looks back at 55 of the most unforgettable Met Gala red carpet looks of all-time. Click through the above gallery for more.

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