Princess Eugenie's upcoming wedding is set to be even bigger than Harry and Meghan's as they invite 250 more people to the event.

The princess will be marrying her long-term boyfriend Jack Brooksbank next month in St George's Chapel in Windsor.

The venue, where Eugenie's cousin Harry wed Meghan Markle in May, has a capacity of 800, meaning there won't be enough seats for the 850 guests invited to the ceremony.

Extra chairs will have to be brought into the chapel to accommodate the guests, but friends say Eugenie and Jack are hoping not all of them will be able to attend according to The Mail on Sunday.

The autumn Royal Wedding will also rival Harry and Meghan's when it comes to celebrities in attendance.

George and Amal Clooney, David and Victoria Beckham, Robbie and Ayda Williams and artist Tracey Emin are among the celebs invited.

There will be a wedding breakfast hosted by the Queen and Duke of York for all guests followed by a champagne reception at the family home in Windsor for 400 select guests.

A royal insider says the Duke of Edinburgh is desperate to attend the wedding as "He absolutely adores Eugenie" but "can't stand Fergie."

The source adds, "Philip and Sarah will be in relatively close proximity to each other and Sarah’s very nervous about it. As long as she doesn’t go over the top on the day, it should all be fine."

The three-course dinner by catering firm Bentley's will cost the Yorks a staggering £100,000 and they will also be paying for a marquee with a glass dance-floor.

"The wedding itself is going to be huge and they are hoping quite a few of the people they’ve invited won’t be able to come because of the capacity issue," said a source.

"The evening party will be the party to end all others." says the source. "There are rumours Ellie Goulding and Robbie Williams will sing."

Andrew wants to retain The Royal Princess status of his two daughters and he has requested that Eugenie be given a carriage procession, as Harry and Meghan were.

He is fearful his children won't be featured prominently if Charles' plans to slim down the monarchy come to light.