As well as a star-studded guest list the Princess, 28, will also beat the royal favourites' in extending her nuptials to spread over two days.
David and Victoria's July 1999 wedding was planned by Armstrong-Jones.
Following the 11am ceremony, Eugenie and Jack will make a short carriage procession to St George's Hall, where traditional wedding breakfast attended by all guests will be hosted by Queen Elizabeth and Duke of York.
While the Queen might have filled her quota for partying on the Friday, those keen to continue the celebrations will be invited to return to Royal Lodge on Saturday October 13.
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For Eugenie, the big day will include almost 850 guests and will be held at Windsor Castle. Everyone from the Kate Moss to the Beckham's are expected to be invited.
"There will be dodgems and funfair rides, coconut shies, lots of food stalls, loads of cocktails, bloody Marys for the hangovers and a festival vibe".
Brooksbank predicts British designer Stella McCartney will create Eugenie's wedding gown, after she designed the Duchess of Sussex's reception outfit. The lucky United Kingdom residents will be able to see Prince Harry, Meghan Markle, Prince William, Kate Middleton, Prince George, Princess Charlotte, and more members of the royal family celebrate Eugenie's big day in person.
The nine in line to the throne does not carry out public duties and receives no allowance from the monarchy.
"Who's heard of Princess Eugenie anyway?"
George and Amal Clooney are also rumored to be there, as Jack is a brand ambassador the Casamigos tequila company, which was cofounded by the Argo actor in 2013. The couple have been dating for seven years, and were first introduced by friends during a ski break in Verbier, Switzerland.