Thus, in contrast to their cousins William and Harry and their wives, 28-year-old Princess, which occupies the ninth place in line of succession, even performs no Royal duties.
The cost of security at Princess Eugenie's wedding is believed to have doubled since her engagement to Jack Brooksbank was announced in January, on account of increased terrorism fears, according to The Mirror.
"This may be the time to review the role and cost of minor Royals".
Some have expressed outrage over the reported security costs, which will be paid for by taxpayers, by pointing out that as a non-working member of the Royal Family who undertakes no engagements on behalf of her grandmother, Princess Eugenie should not be covered by the public.
The wedding was initially said to be costing around £750,000 and was set to be paid for by the couple's parents, but security costs have more than doubled it to nearly £2m, according to the Daily Mirror.
Like the Duke and Duchess of Sussex, Princess Eugenie and Mr Brooksbank will take a carriage procession from the chapel through Windsor High Street and the grounds of Windsor Castle.
The £1.25million increase in expenses are said to be due to officers' overtime, cancellation of holidays and the need for extra patrols.
Drones are expected to be banned from flying over Windsor Castle throughout the marriage celebrations and the police officers will be dispersed throughout the town.
Emma Dent Coad, Labour MP for Kensington, where the couple live, was not impressed.