And while everyone is comparing Eugenie's wedding to Prince Harry and Meghan's lavish affair, some royal fanatics have noticed the similarity between Eugenie's and Catherine's engagement rings.
The couple will then take a short carriage trip through Windsor, echoing that of Harry and Meghan when huge crowds turned out to watch.
Princess Eugenie and Jack have also opted to break tradition with their wedding cake, opting for an autumnal red velvet and chocolate confection instead of customary iced fruit cake.
The Duke and Duchess of Cambridge's eldest two children and Williams' six-year-old daughter, who is known as Teddy, will be among the pageboys and bridesmaids at the celebration in Windsor on Friday.
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Almost all Britain's senior royals are expected to attend although Prince Charles's wife Camilla will be absent as she has a prior engagement in Scotland.
The couple has also asked Princess Beatrice, Eugenie's older sister, to be her Maid of Honour, while Thomas Brooksbank, Jack's brother, will be best man.
"Britain's top-selling Sun newspaper ran a front page story on Wednesday with the headline "£2m too much for Eugenie wedding", saying the event could have been held at a chapel near her childhood home.
After the ceremony, Queen Elizabeth will host a reception for the newlyweds and their guests at Windsor Castle.
The This Morning at the Royal Wedding show continues until 12.30pm. However, the spouses might be missing from another integral portion of Eugenie's weekend wedding festivities-and with good reason.
These concerns aren't popular in Windsor's business community, where the surging popularity of the royal family in recent years - and the afterglow of Harry and Meghan's wedding - has helped bring in visitors in recent months.