Windsor will host its second royal wedding of the year on Friday when Princess Eugenie, the younger daughter of Prince Andrew and Sarah, Duchess of York, marries her long-term boyfriend, tequila brand ambassador Jack Brooksbank.
Prince Louis, who has only been seen in public twice at his birth and his christening, has not yet been seen at the wedding. Only eight years old at the time, the youngster looked simply adorable in a white bridesmaid dress, and joined the family while waving to well-wishers on the Buckingham Palace balcony.
Eugenie is ninth in line to the throne.
It was confirmed Prince George, Princess Charlotte and Robbie Williams' daughter Theodora will be among the bridesmaids and pageboys. "A lot of tourists don't even know about this wedding Friday, but it will bring in the crowds and should be a good day for us".
The Prince said that Princess Eugenie and Jack Brooksbank have "so many friends".
In an interview with British Vogue earlier this year, Eugenie said she is "anti-plastic" and aims for the wedding to be plastic-free.
Brooksbank and Eugenie have dated for many years.
The policing costs will have been increased by the 1km carriage ride the couple will make through the town after the ceremony.
International Monetary Fund upgrades outlook on Russian Federation as economy recovers
It's not just the world's two most powerful economies that stand to be affected by trade policy. These risks, it says, while still moderate, could increase significantly.
Harry and Meghan, a former star of the TV show "Suits", are also expected.
The ceremony was overseen by the Dean of Windsor David Conner and charity guests and 1,200 members of the public were invited into the grounds for the occasion.
Princess Beatrice, Eugenie's older sister, is maid of honour, while the groom's brother, Thomas Brooksbank, is the best man.
The presence of so many royals - and a number of celebrity guests - has prompted extra security measures to be put in place.
But Eugenie, who is not a working royal, and Jack will not head up the Long Walk like Harry and Meghan, but take a shorter route back to the castle.
"This is so they do not upstage the bride", she said on United Kingdom chat show This Morning.