Armstrong-Jones, who famously planned the opulent July 1999 wedding of David and Victoria Beckham, has allegedly been busy organising a star-studded celebration for Saturday October 13, the day after the royal pair say "I do".
The Duke and Duchess of Sussex invited just 600 guests to their wedding in May - but Princess Eugenie is set to out-do them with a massive 850 invites.
The royal has reportedly invited more guests than St George's Chapel will hold.
And the similarities between the two weddings don't stop there.
"Whilst Meghan and Harry's wedding was an worldwide spectacular, Eugenie and Jack will be having a more homely occasion celebrating the best of Britain, but with an equally star studded guest list".
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 Prince Andrew will be paying for some of Eugenie's wedding, the British taxpayer will be covering the cost of the security.
According to United Kingdom publication, The Sunday Times, Armstrong-Jones is also organising a "festival and funfair" themed party in the grounds of the Royal Lodge, which will include "dodgems and funfair rides, coconut shies, lots of food stalls, loads of cocktails, bloody Marys for the hangovers and a festival vibe". The 97-year-old is not only recovering from hip surgery but apparently can't stand Eugenie's mother, Fergie.
"He absolutely adores Eugenie".
'Philip and Sarah will be in relatively close proximity to each other and Sarah's very nervous about it. People have been giving her some friendly advice.
Fascinator aficionado Princess Eugenie is about to celebrate her big day, and it looks like the reigning queen of bonnets is going all out for her October 12 nuptials.
Meghan Markle's May 19 wedding to Prince Harry will no doubt go down in history. The dinner alone is reportedly setting the Yorks back $130,000.
"It is Eugenie and Jack's party and they are very much involved in all the details and decisions", the insider said.