30 Stunning Photos of Royals at the Met Gala

Charlotte Casiraghi is a Met Gala regular. Here, she wears a high-low Saint Laurent dress for 2019's "Camp: Notes on Fashion" theme.

Purple is the color of royalty, so it makes sense that Princess Beatrice chose this gorgeous Alberta Ferretti number. Her bejeweled hair accessories gave a nod to that year's "Heavenly Bodies: Fashion and the Catholic Imagination" theme.

Outside the event, fans could really see the movement of Princess Beatrice's flowing dress.

Charlotte Casiraghi chose a black look for her 2018 Met Gala ensemble, wearing an asymmetrical Saint Laurent dress. Her accessories—platform boots—were a bold choice.

Princess Elisabeth von Thurn und Taxis's Simone Rocha dress fit the avant-garde theme of the year, which was "Rei Kawakubo/Comme des Garçons: Art of the In-Between" and celebrated the work of designer Rei Kawakubo.

The year prior, Princess Elisabeth nailed the "Manus x Machina: Fashion in an Age of Technology" theme in a futuristic Mary Katrantzou look.

The back of her dress had buttons up the top, and she wore her hair in a sleek updo.

Princess Maria-Olympia of Greece take on 2016's machine-related theme was this silver Balmain dress.

The 2016 Met Gala was a big one for royals. Another attendee was Queen Rania of Jordan, who captured the same theme in a black and silver mesh Valentino dress.

A closer look at the Queen's elaborate floral hair pin.

Unlike other royals at the 2016 Met Gala, who wore shades of black and silver, Charlotte Casiraghi arrived in a bright Gucci dress.

Here she is with actress Dakota Johnson, singer Florence Welch, and fashion designer Alessandro Michele.

Princess Elisabeth von Thurn und Taxis (center) wore Valentino for the 2012's "Schiaparelli and Prada: Impossible Conversations" event. The theme celebrated two other iconic Italian designers: Elsa Schiaparelli and Miuccia Prada.

Lee Radziwill looked elegant for the 2010 theme of "American Woman: Fashioning a National Identity." She wore a flowy white gown and arrived with Reinaldo Herrera, the husband of designer Carolina Herrera.

Queen Rania of Jordan and her guest coordinated in dark-colored outfits for the "Poiret King of Fashion"-themed Met Gala. She opted for a black belted gown with capped sleeves.

Casiraghi attended the Met Gala with his now wife, Tatiana Santo Domingo in 2006.

While the royal chose to accessorize with a white scarf, Santo Domingo opted for a bright orange shawl.

Here, the Princess arrives at the event with the designer who made her gown, Valentino Garavani.