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 west of London.
Windsor Castle was also the venue for the wedding of Harry and Meghan Markle in May, and Eugenie, ninth in line to the throne, has copied much of her cousin's blueprint for her big day.
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. The strong winds forced many women to hold on to their elaborate hats as they approached the chapel.
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 were invited onto the grounds for the occasion.
Zara Phillips and Princess Anne arrive at Royal Wedding
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:
The queen and her husband, Prince Philip, attended the wedding, along with other senior royals, including Prince Charles; Prince William and his wife Kate, the duchess of Cambridge; and Prince Harry with Meghan, the duchess of Sussex.
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, 3, daughter of Harry's elder brother, Prince William, and his wife, Kate, was a bridesmaid while her brother, Prince George, 5, 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.
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.
The A-list guests included Hollywood stars Demi Moore and Liv Tyler, fashion luminaries Kate Moss, Cara Delevingne and Naomi Campbell and pop singer Robbie Williams, whose daughter was a bridesmaid.
As Eugenie 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 is 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.
"The Royal Family paid for the service itself, but the British taxpayer is expected to pick up the £2-million ($3.5 Cdn) tab for the security and cleanup after the service," said CBC's Thomas Daigle, reporting from Windsor.
The brides parents left the chapel together smiling as the newlyweds embarked on a horse-drawn carriage ride through parts of Windsor.
The anti-monarchy group Republic has presented to Labour MP Emma Dent Coad the results of an online petition with nearly 50,000 signatures. It calls on the U.K. government to commit no public money to the wedding and to publish a report of all costs to taxpayers.
"I support this petition, apart from those who first signed it," Coad said in an interview this week outside the U.K. Parliament.
"To me, it's unconscionable that a minor member of the Royal Family who doesn't even have a role is having her dream wedding subsidized when in the same borough which she's moving into, in Kensington, we have food banks. We have people literally starving," she said.
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Princess Eugenie and Jack Brooksbank tied the knot at St George’s Chapel in Windsor Castle on Friday, Oct. 12, and it’s hardly surprising there were quite a few celebrities on the guestlist.
The likes of supermodel Naomi Campbell, Prince Harry’s ex Chelsy Davy and Kate Moss joined Prince Harry, Meghan Markle, Kate Middleton and Prince William to attend the couple’s special day. See more in the gallery below.
Princess Charlotte and Prince George definitely brought the cute factor as they were pictured arriving to do their page boy and bridesmaid duties.
Charlotte, as per usual, was pictured perfecting her adorable wave for the crowd as the youngsters made their way up the steps and inside the chapel.
Kate Middleton dressed to impress in an eye-catching fuschia dress by Alexander McQueen as she was seen arriving at Princess Eugenies wedding.
Meghan Markle donned a stuning navy blue Givenchy dress as she was seen arriving at Princess Eugenies royal wedding to Jack Brooksbank.
Cressida Bonas looked stunning in a blue Tory Burch dress as she was pictured arriving at Princess Eugenie and Jack Brooksbanks wedding.
Prince Harry, Prince William and Kate Middleton were pictured sharing a joke inside the ceremony at Princess Eugenies royal wedding to Jack Brooksbank.
Pippa and James Middleton joined James Matthews at the royal wedding, with the group being pictured making their way inside the church.
Pippa opted for a chic green number for the special day, with her teaming the get-up with a matching fascinator.
Kate Moss and her daughter Lila Grace Moss Hack were pictured arriving at Windsor Castle ahead of the royal wedding, with Moss opting for a polka dot ensemble.
Her daughter, on the other hand, went for a peach dress which she teamed with a black jacket and sleek down do.
Kate Middleton and Prince William were pictured saying hello to Right Reverend David Conner as they arrived at Windsor Castle for the ceremony.
Princess Eugenies mother Sarah Ferguson and her sister Princess Beatrice were seen waving to crowds as they arrived at Windsor Castle.
Ellie Goulding rocked a boho chic look as she was pictured arriving at Princess Eugenies wedding to Jack Brooksbank.
Cara Delevingne looked incredibly chic as she donned a black suit and tie and matching top hat for Princess Eugenies wedding to Jack Brooksbank.
Demi Moore was among guests at Princess Eugenies royal wedding to Jack Brooksbank, with her looking as stunning as ever in a maroon get-up and a matching fascinator.
The actress was seen holding on to her hat as she braved the windy conditions to make her way to the church.
Prince Harrys ex-girlfriend Chelsy Davy was seen holding on to her fascinator as she braved the blustery conditions to attend Princess Eugenie and Jack Brooksbanks special day.
Naomi Campbell looked as stunning as ever as she arrived at Windsor Castle in a stunning metallic ensemble, which she teamed with a matching fascinator.