Eugenie, 28, younger daughter of the Queen's third child, Prince Andrew, and his ex-wife, Sarah Ferguson, the Duchess of York, married Jack Brooksbank, 32, at the monarch's home to the west of London.
Windsor Castle was also the venue for Harry and Meghan's wedding in May, and Eugenie, ninth-in-line to the throne, has copied much of her cousin's blueprint for her big day.
The ceremony was conducted by the Dean of Windsor David Conner, and Eugenies elder sister, Princess Beatrice, the maid of honor, read an extract from the F. Scott Fitzgerald novel “The Great Gatsby” which the bride had read after meeting her future husband in the Swiss ski resort of Verbier in 2010.
Holding their hats, guests celebrate next big royal wedding
The ceremony took place at the castle's 15th-century St. George's Chapel with the Dean of Windsor David Conner officiating. Charity guests and 1,200 members of the public have been invited into the grounds for the occasion.
“There will be a few more people than most people have, there are a few more than Harry had, but thats just the nature of Eugenie and Jack – theyve got so many friends that they need a church of that size to fit them all in,” he told “This Morning” which broadcast the event live.
One noticeable absentee was Camilla, the Duchess of Cornwall, the wife of heir-to-the-throne Prince Charles, as she was carrying out an engagement in Scotland.
While Harry's wedding featured a fiery sermon from a U.S. Episcopalian bishop and a gospel choir, Eugenie's was more traditional with a performance by Italian tenor Andrea Bocelli and the address given by Conner.
Watch the arrival of some of the celebrity guests, including actress Liv Tyler and model Naomi Campbell:
Her elder sister Princess Beatrice, the maid of honour, delivered one of the readings, an extract from The Great Gatsby.
Several celebrities were among the guests — including singer Robbie Williams, actress Liv Tyler, models Naomi Campbell and Cara Delevingne, actress Demi Moore, television presenter Stephen Fry, and singers James Blunt and Ellie Goulding.
Princess Charlotte, three, daughter of Harry's elder brother, Prince William, and his wife, Kate, was a bridesmaid while her brother, Prince George, five, was a page boy.
After the service, the couple was to embark on an open-top carriage tour of Windsor, although shorter than the one Harry and Meghan, now the Duke and Duchess of Sussex, took when thousands lined the streets of the town.
Eugenies dress, by Peter Pilotto and Christopher De Vos of the London-based label Peter Pilotto, had a low back to reveal scars from surgery she underwent to correct scoliosis when she was 12.
Eugenie, a director at London's Hauser & Wirth art gallery, and Brooksbank, who is European brand manager for Casamigos Tequila, which was co-founded by U.S. actor George Clooney, met in the Swiss ski resort of Verbier in 2010.
As Eugenie — ninth-in-line to the throne — does not carry out official royal duties, republicans and some newspapers have said it is wrong that the security bill for the event will be paid for by taxpayers because the Royal Family are only paying for the wedding itself.
But local council deputy leader Phillip Bicknell was relishing the prospect of another big royal draw.
"The monarch and her family are part of the shop window for Great Britain, and at the end of the day anything that goes on that creates people wanting to come to this part of the world — come and see what goes on in Windsor — we're very happy for that," he said.
“Its a lovely way to honor the people who looked after me and a way of standing up for young people who also go through this,” she told ITVs “This Morning” ahead of the wedding.
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It was a morning of windswept wardrobe malfunctions as ladies held on to their fascinators and the tails on the gentlemens morning jackets flapped behind them during a blustery day at the Windsor Castle royal wedding of Princess Eugenie and Jack Brooksbank.
The wind posed a daunting challenge for guests making their way up the steps of St. Georges Chapel for the royal wedding Friday, as the crowd of commoners looked on. A few men could be seen chasing after their wind-blown top hats while women struggled to control their skirts in the unpredictable gusts.
Supermodel Naomi Campbell appeared to have a difficult time keeping her large fascinator in place as she approached the castle. Prince Harrys ex-girlfriend Chelsea Davy didnt seem to mind the wind as much as others as she laughed while holding on to her own headpiece.
Even seasoned royal Princess Anne was photographed with her head bowed and a gloved hand on her green fascinator as she coped with the elements.
For one attendee, however, the wind proved to be too much and she was caught off guard in perhaps the worst of moments.
Lady Louise Windsor, ushering the bridesmaids and pageboys, including Prince George and Princess Charlotte, up the steps to the chapel had an embarrassing wardrobe malfunction when the wind conspired to lift her short hemline.
As she made her way up the stairs, holding on to two of the childrens hands, a gust of wind blew the bottom of the womans navy dress aloft, exposing her undergarments.
Queen Elizabeth IIs youngest granddaughter appeared to recover quickly, flattening her skirt behind her as she disappeared through the doorway.
The incident happened seconds after pageboy Louis de Givenchy lost his balance and fell on the stairs.
When the brides mother Sarah Ferguson, Duchess of York, emerged from her vehicle in front of the chapel she made a beeline towards the crowd of onlookers. She gave a big hug to one older woman sitting in a chair and was about to embrace a man standing nearby before she appeared to change her mind.
As the man went in for a hug, the duchess, holding his face, hesitated and back away. She then turned and walked back to the stairs to join her other daughter Princess Beatrice who was waiting for her.
The Bridesmaids and Page Boys have arrived at St Georges Chapel! #RoyalWedding pic.twitter.com/k26Z2uGeNB
Someone in the wedding party just flashed some serious frilly lace pants to the entire world on the steps … Poor girl.#RoyalWedding
I was waiting for that dress to show her pants tbh…its really windy,what do you expect? #RoyalWedding