Prince Andrew and Sarah, Duchess of York, are divorced, but remain close and have been seen together, including at Royal Ascot in 2015, along with their daughters, Princess Eugenie, centre, and Princess Beatrice, far right.
As well as her newly-dyed hair, Eugenie showcased her slender physique amid reports she has relied on the help of nutritionist Gabriela Peacock to slim down ahead of her nuptials. Royal wedding merchandise fill the windows - but they feature Harry and Meghan Markle, who also married at Windsor Castle in May in a spectacular, globally televised ceremony.
The couple were at Windsor on Thursday for a wedding rehearsal.
Drinks executive Jack Brooksbank, 32, dated Princess Eugenie for about seven years before proposing while they were on holiday in Nicaragua. They will also have Prince George and Princess Charlotte in their wedding party and even some of the same guests like George and Amal Clooney.
The newlyweds will then depart on a short carriage procession around Windsor.
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A Gaelic Blessing will be sung by the choir, and Italian singer-songwriter Andrea Bocelli will perform Bach's Ave Maria.
The wedding will also be streamed live on the internet for people across the world to enjoy.
The attendance of the bride's grandfather, the Duke of Edinburgh, who is 97 and has retired from public life, will reportedly be decided on a "wake up and see how I feel" basis.
There has been some criticism about the cost of security around the event, which will be paid for by the taxpayer like all royal events.
Eugenie and Jack will marry at St. George's Chapel at Windsor Castle on Friday, October 12.
And similar to Harry and Meghan, Eugenie and her fiancé will invite 1,200 members of the public to the castle grounds for a better view of Friday's festivities.
Princess Eugenie is the daughter of the Duke of York and Sarah Ferguson.