While all eyes were on the bride, who stunned in a gown by Givenchy, when she walked down the aisle, a few of the guests made their presence known with their own outstanding looks -- and even more outstanding fascinator hats.
From Amal Clooney to Lady Kitty Spencer, these are the best dressed of the day:
Oprah stunned in a lace-trimmed, blush, double tiered Stella McCartney dress made of sustainable viscose. An appropriately over-the-top wide-brimmed Philip Treacy hat with matching flourishes sat atop her head. The 64-year-old TV personality accessorized with mary jane style mules and a small, structured, top handle Gabriela Hearst handbag. Oprah revealed in an Instagram post that her dress was made overnight, but she has had the hat in her closet since 2005.
The human rights lawyer chose a stunning, saffron yellow bespoke Stella McCartney midi dress for the special occasion. The dress included a dramatic pleated sash detail down the back. The mother-of-two also wore a coordinating Stephen Jones hat, which featured netting detail with delicate paillettes. Clooney, 40, accessorized with 17 carat pear shape drop earrings set in 18 karat white gold from Lorraine Schwartz and Gianvito Rossi heels.
The actor sported a grey Giorgio Armani suit and light pink tie for the occasion.
James Blunt's wife wore an embroidered floral dress by Red Valentino with a nude fascinator.
David Beckham looked dashing in Dior Homme charcoal grey super 130’s wool twill morning coat and pants. Beckham, 43, also wore a light grey super 150’s wool twill double-breasted waistcoat, a white 200/2 Egyptian cotton poplin shirt, a grey silk satin tie, a grey silk satin pocket square, and derbies in black calfskin leather.
The former Spice Girl wore a navy dress from her own line. In one of her signature silhouettes, the sleek dress featured fluid sleeves and took cues from the fall 2018 collection with its buckle detailing. The 44-year-old also wore red pumps and small veiled headpiece.
Kate Middleton’s sister sported a mint-green floral dress with a pleated skirt. The dress was made by The Fold and is valued at just over $580. The 34-year-old accessorized with nude Jimmy Choo pumps and a matching clutch.
The longtime friend to the bride stunned in a soft lavender custom Vivienne Westwood suit with a sharply angled Philip Treacy hat and Jimmy Choo by Off White shoes. The Quantico star wore Lorrianne Schwartz jewelry including 18 karat gold and diamond lightning bolt earrings as well as diamond rings.
The tennis star glowed in a blush pink tailored Versace dress and matching fascinator. A Bulgari necklace from the Heritage collection completed her look.
Lady Kitty Spencer
Princess Diana's niece wore an emerald green Dolce and Gabbana dress.
A friend of the bride, the 37-year-old wore a bold orange vintage ensemble and hat paired with Sigerson Morrison heels.
The Timeless star was wearing a long sleeve, polka dot Alessandra Rich dress.
Delfina Balquier & Nacho Figueras
Polo star Figueras wore a navy suit for the occasion. Balquier chose a light blue Acheval Pampa gown and hat, the former of which matched her husband's shirt.
The actor wore a classic navy Givenchy suit and white dress shirt for the big event.
Here's the Duke and Duchess of Sussex's debut as husband and wife: