Unlike other royal weddings, the day will not be broadcast on BBC, with ITV's This Morning instead taking over the coverage.
More than 850 guests are expected to attend the ceremony including the Queen and Prince Philip, Prince Harry and Meghan, Prince William and Catherine, as well as celebrities including Victoria and David Beckham, George and Amal Clooney, Sir Elton John, Ed Sheeran and Robbie Williams.
Princess Eugenie and Jack Brooksbank are set to marry in St Georges Chapel at Windsor Castle at 11:00 GMT (12:00 CAT) on Friday, 12 October.
The traditional "to obey" has been taken out.
When Princess Eugenie walks up the aisle on Friday, she will be accompanied by six bridesmaids.
Following the ceremony, the Queen will host an afternoon reception at Windsor Castle lunchtime party.
The little royals are no strangers to these roles.
Once the formalities are out of the way, the new husband and wife team will leave St George's Chapel - most likely treating the waiting crowd to a kiss on the West Steps.
The royal couple will say their vows in St. George's Chapel and afterward, the newlyweds will ride through the streets of Windsor in a royal carriage just as Meghan and Harry did on their wedding day.
According to BBC News, 1,200 members of the public have been invited to the wedding at Windsor Castle.
The stressed-out bride is not only said to have attacked poor Kate by insisting she was forbidden from arriving through the main entrance, but Eugenie's diva demands, fights with the wedding planners and blow out budget mean the event is swiftly turning into a disaster.