Queen Elizabeth's granddaughter Princess Eugenie married wine merchant Jack Brooksbank at Windsor Castle on Friday in front of celebrities and Britain's senior royals including Prince Harry and wife Meghan who wed at the same venue in May.

Eugenie, 28, younger daughter of the queen's third child, Prince Andrew, and his ex-wife, Sarah Ferguson, the Duchess of York, tied the knot with Brooksbank, 32, in a traditional ceremony in the castle's 15th Century St George's Chapel.

Eugenie's 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.

"It's a lovely way to honour the people who looked after me and a way of standing up for young people who also go through this," she told ITV's "This Morning" ahead of the wedding.

The couple, while showing clear signs on nerves, beamed happily during the hour-long service.

The 92-year-old queen and her husband Philip, 97, who has retired from official engagements, were joined by other royals and celebrities including Hollywood stars Liv Tyler and Demi Moore, models Kate Moss and Naomi Campbell and singer Ellie Goulding.

Princess Charlotte, 3, daughter of Harry's elder brother Prince William and his wife Kate, was a bridesmaid, and her brother, Prince George, 5, a page boy.

Final preparations were being made in the English town of Windsor on Thursday (Oct 11) for Britain's second major royal wedding this year,

this time involving Queen Elizabeth's granddaughter Princess Eugenie.

Eugenie, younger daughter of the Queen's third child Prince Andrew and his former wife Sarah Ferguson, the Duchess of York, will tie the knot with Jack Brooksbank, at the monarch's Windsor Castle home on Friday.

Guests wait for the royal wedding of Princess Eugenie and Jack Brooksbank in Windsor Castle

Guests arrive ahead of the wedding of Princess Eugenie to Jack Brooksbank at St George's Chapel in Windsor Castle

British singer-songwriter Robbie Williams

American supermodel Naomi Campbell

American actress Demi Moore

American actress Liv Tyler

Chelsy Davy

Guests take their seats as they arrive to attend the wedding of Britain's Princess Eugenie of York to Jack Brooksbank at St George's Chapel, Windsor Castle.

The couple have likewise invited 1,200 people from across Britain to join in the celebrations in the castle grounds and to watch the newlyweds leave St George's Chapel after the service.

They will then take an open-top carriage ride through Windsor, although it will be shorter than the one Harry and Meghan took in May when thousands thronged the streets and hundreds of millions worldwide watched on television.

The Dean of Windsor will officiate the ceremony and Italian tenor Andrea Bocelli will perform during the service.

The ceremony will be broadcast on British TV and live streamed on the Royal Family and Prince Andrew's YouTube, Facebook and Twitter channels.

Baker Sophie Cabot preparing and baking parts of the red velvet and chocolate Royal Wedding Cake in the kitchens of Buckingham Palace in London .

Face masks can be seen on sale at a gift shop ahead of the royal wedding between Princess Eugenie and Jack Brooksbank.

While the royal family is paying for the wedding itself, there has been disquiet among republicans and some newspapers over the security bill for the event, which has been estimated at more than £2 million, given that Eugenie does not carry out official royal duties.

Britain's Prince Harry and American actress Meghan Markle were pronounced husband and wife on Saturday by the Archbishop of Canterbury

in a glittering union that brought a measure of modern Hollywood glamour into the 1,000-year-old monarchy.

Markle entered the chapel unescorted, dressed in a flowing white gown created by British designer Clare Waight Keller and wearing a veil and diamond tiara.

In a ceremony that combined modernity and the ancient rituals of a royal house that dates back to 1066, Prince Charles, heir to the throne and Harry's father, accompanied Markle to the altar from the middle of the chapel.

When Meghan Markle walked down the aisle to marry Prince Harry on Saturday, she had with her the 53 countries of the Commonwealth - each one represented in the embroidery of her veil.

Waight Keller, who became the first female artistic director at famed French house Givenchy last year, said Meghan loved the idea of "all of those countries walking with her through the ceremony."

The newlyweds will be known as the Duke and Duchess of Sussex, putting them in the senior ranks of British royalty.

But alongside tradition, there was innovation, by British royal standards. Markle, 36, did not vow to obey her husband; Harry, three years her junior, will wear a wedding ring - unlike other senior male royals.

Britain's Queen Elizabeth II looks on during the wedding ceremony

The chapel was adorned with white roses, Diana's favourite flowers.

The service was conducted by the Dean of Windsor with Justin Welby, Archbishop of Canterbury and spiritual head of the Anglican Church, overseeing the exchange of vows. Lady Jane Fellowes, Diana's sister, delivered the reading.

Meghan's mother Doria Ragland and Prince Charles leave after the ceremony.

Doria Ragland, Prince Charles and wife Camilla Parker Bowles

The royal couple, who met on a blind date in 2016 and fell in love in a tent under the stars in Botswana, tied the knot in a castle that has been home to 39 English monarchs since 1066.

Prince Harry's ex-girlfriend Cressida Bonas was among the guests.

Princess Charlotte and Duchess of Cambridge, Kate Middleton

Prince George

Kate Middleton's sister, Pippa Middleton

Queen Elizabeth and Prince Philip

Earl Spencer, the late Princess Diana's brother.

Sarah Ferguson

After the ceremony, the newlyweds greeted some of the 1,200 members of the public invited into the castle grounds before starting a carriage procession through Windsor.