The one thing Princess Eugenie is NOT allowed to do on her wedding day (but all other brides can)

But ahead of her big day tomorrow, there is one rule in particular that Princess Eugenie absolutely must abide by… and it's all down to some super strict Royal etiquette.

Yes, it turns out The Queen's youngest granddaughter cannot be running late on her wedding day tomorrow.

Unlike normal brides who might opt to make their grooms sweat while waiting at the altar, Princess Eugenie will ensure to leave plenty of time to get to St George's Chapel in Windsor to avoid upsetting The Queen.

Speaking exclusively to Fabulous Online, The Queen's former press spokesperson Dickie Arbiter revealed: "The Queen doesn't do late.

"She does on time and is she has to be late somewhere it will be for a very good reason, that there's a breakdown somewhere or she's struck in traffic."

Therefore out of respect for the monarch, her "offspring and the grandchildren don't arrive late either."

And judging by what we know of the strict wedding schedule so far, every minute of Eugenie's special day has been meticulously planned to avoid any delays or tardiness.

Following the advice of etiquette experts Debretts, Jack Brooksbank will appear 45 minutes before the 11am ceremony while Princess Eugenie and her father Prince Andrew will arrive with just five minutes to spare at 10:55am.

Meanwhile, the Royal bride-to-be has also taken Debretts' advice by "planing out the events of the day to make the best use of the time."

Following their traditional church service, the Royal newlyweds will then enjoy a carriage ride through the streets of Windsor before retiring to the Queen's residence for a champagne reception… here's hoping it all runs smoothly.

In even more Royal Wedding news, this is how Princess Eugenie's title will change when she marries Jack Brooksbank.

And this is why Princess Eugenie and Jack Brooksbank's wedding guests can't use the loo after 10am… and more things they're banned from doing.

Plus this is why Meghan Markle and Prince Harry may skip Princess Eugenie's wedding reception.

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