Eugenie and Jack sealed their marriage with a kiss in a stunning Royal Wedding rocked by some almighty stormy weather.
The princess, 28, was seen performing an impressively low curtsy to her grandmother inside St George's Chapel after exchanging vows with Jack Brooksbank.
Williams' six-year-old daughter Theodora Williams will be one of Eugenie's bridesmaids alongside Princess Charlotte, Prince William's daughter.
Princess Eugenie and Jack Brooksbank during their wedding ceremony at St George's Chapel in Windsor Castle, Windsor October 12, 2018.
The couple will marry in the same venue used in May by Prince Harry and Meghan Markle, who is now known as the Duchess of Sussex.
Eugenie's nuptials had much of the same pomp and pageantry as Harry's, but the grandeur for a "minor royal" attracted some criticism.
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Eugenie's sister, Princess Beatrice, served as maid of honour, while Jack's brother Thomas was best man.
It looks like Meghan and Harry's touchy-feely vibes were contagious, because Prince William and Kate Middleton (who were sitting next to them) also had a rare PDA moment: They were photographed holding hands in the pews.
Eugenie's wedding dress was designed by Peter Pilotto and Christopher De Vos and featured long sleeves with a flowing train, folded shoulders, and a low back.
There were occasional blue skies on a generally cloudy, gusty day as the royal standard flew atop the Windsor Castle complex, indicating the queen was in residence.
Eugenie, a director at London's Hauser & Wirth art gallery, and Brooksbank, who owns a wine wholesale business and is European brand manager for Casamigos Tequila, which was co-founded by USA actor George Clooney, met in the Swiss ski resort of Verbier in 2010.
Security around Windsor was tight, with airport-style checks and a heavy police presence.
Another, asking for bids of £200, said it was a "very rare collectors item for those who love the British Royal Family and British Royal Weddings".