There's less than one-month to go until Princess Eugenie weds Jack Brooksbank, and the stress of planning her big day has turned the royal into a total bridezilla, OK! reports.
According to a royal insider, Eugenie, 28, wants her and Jack's wedding to be 'every bit as fancy' as Prince Harry and Meghan Markle's, but trying to achieve that has caused her to become a 'loose cannon.'
'From her weekly dress fittings to dictating guests' outfits, her behaviour is driving people around her nutty,' the insider says.
'All Jack can do is try to assure her that everything will fall into place.'
Eugenie has also come under fire in the last month for 'blatantly copying' Meghan and Harry's nuptials.
Along with the Windsor Castle location, Eugenie and Jack have decided to invite members of the public to witness their big day.
In an official statement, Kensington Palace revealed: 'Her Royal Highness Princess Eugenie of York and Mr. Jack Brooksbank will invite members of the public to join in the celebrations of their wedding on Friday 12th October.
'The couple are delighted to announce an opportunity for 1,200 people from across the United Kingdom to be invited into the grounds of Windsor Castle to share the experience of their special day.'
'The attendees will view the arrival of the congregation and Members of the Royal Family, listen to a live broadcast of the Marriage Service and watch as the Bride and Groom depart St George's Chapel at the end of the ceremony.'
Similarly to Harry and Meghan, the newlyweds will also undertake a short carriage procession through Windsor High Street.
'The carriage will process through the grounds of Windsor Castle, departing via Castle Hill to proceed along part of the High Street before returning to the Castle via Cambridge Gate,' the statement read.
Another similarity comes as representatives of charities beloved by Eugenie and Jack will also be in attendance.
The statement said: 'Also present in the Castle Grounds will be representatives of charities supported by Princess Eugenie and Jack Brooksbank, together with members of the Windsor community and children from the local schools which Her Royal Highness attended. Residents of Windsor Castle and a number of Royal Household staff will also be present.'
Princess Eugenie, the daughter of the Duke and Duchess of York, Prince Andrew and Sarah Ferguson, announced her engagement to the nightclub manager back in January.
Speaking to the BBC's The One Show, the Queen's granddaughter admitted that the proposal was 'a complete surprise,' explaining that they were watching the sunset over a lake before the moment.
She said: 'The lake was so beautiful. The light was just a special light I had never seen. I actually said this is an incredible moment, and then he popped the question, which was really surprising even though we have been together seven years.
'I was over the moon. [It was a] complete surprise. But it was the perfect moment, we couldn't be happier.'