Meghan Markle and Prince William reportedly found themselves in a furious bust-up after the Duchess of Sussex made a comment about her sister-in-law's hormones.
In a leaked extract of his new book Spare, Prince Harry claims that in the run up to their wedding in 2018, Meghan brazenly told the Princess of Wales that she must have "baby brain".
The comment wasn't well-received and the foursome later met in a bid to try and move past the incident - but this led to a row between Prince William and Meghan, the book claims.
Kate gave birth to her third child, Prince Louis, just a month before Meghan and Harry's big day and was heavily pregnant at the time of the fitting.
During all three of her pregnancies, she suffered from hyperemesis gravidarum - excessive nausea and vomiting caused by a hormone imbalance.
In the book Spare, Harry reportedly recounts how Kate was upset - but Meghan apologised and explained that is how she speaks to her friends, the Sun reported.
But Harry said William "pointed a finger at Meg", then allegedly blasted: "Well, it's rude, Meghan. These things are not done here."
To which Meghan responded: "If you don't mind, keep your finger out of my face."
This remark reportedly left Meghan upset - especially as she was reportedly warned she wasn't close enough to Kate to make a remark about her hormones.
Kensington Palace and Buckingham Palace have so-far declined to comment on the leaked claims from Harry's book which emerged five days before the explosive tell-all autobiography Spare is due to be published.
An extract from the book was leaked by the Guardian - before the Sun found a copy on sale in a Spanish bookstore despite the tight pre-launch security.
In it, Harry claims he was physically attacked by his brother in a row and that it was him and the Princess of Wales who encouraged him to wear a Nazi uniform to a fancy dress party 2005
Harry wrote: "William called me another name, then came at me. It all happened so fast. So very fast. He grabbed me by the collar, ripping my necklace, and he knocked me to the floor.
"I landed on the dog’s bowl, which cracked under my back, the pieces cutting into me. I lay there for a moment, dazed, then got to my feet and told him to get out.”
William went on to call Meghan "difficult”, "rude” and "abrasive”, claims Harry - before allegedly saying he was trying to help and Harry replying: "Are you serious? Help me? Sorry – is that what you call this? Helping me?”
The duke said the comment further infuriated William who reportedly swore while stepping toward him - prompting Harry to move to the kitchen.
He then claimed William called him another name before he "came at me” with it all happening "very fast” before the alleged physical confrontation.
The duke writes that William urged him to hit back, referencing fights they had as children, but that he refused and William left before returning and apologising.
Harry writes that William told him he did not need to tell "Meg” about this and added: "I didn’t attack you, Harold.”
The duke says he did not tell Meghan straight away but did ring his therapist, and later admitted to his wife what happened when she saw the "scrapes and bruises”.
Meanwhile, US website Page Six said sources reveals how Harry puts some of the blame for his Nazi uniform scandal on William and Kate.
He tells how the 20-year-old phoned the couple to ask them whether he should chose a pilot’s uniform or a Nazi one for the fancy dress party and William and Kate said the latter, and both howled with laughter when he and tried it on for them.
Harry, then 20, sparked outrage and was widely condemned when a photograph of him in the uniform complete with swastika ended up on the front page of a newspaper.
He admitted in his Netflix tell-all: "It was probably one of the biggest mistakes of my life.”
Amid the claims, ITV released a new trailer for Tom Bradby’s interview with the Duke, which will be broadcast on Sunday night.
Bradby challenges Harry on "invading the privacy of your most nearest and dearest without permission”.
Harry replies: "That would be the accusation from people that don’t understand or don’t want to believe that my family have been briefing the press.”
The duke is also seen saying: "I don’t know how staying silent is ever going to make things better.”
ITV News at Ten presenter Bradby – a friend of Harry’s – says: “Wouldn’t your brother say to you, ‘Harry, how could you do this to me after everything? After everything we went through?’ Wouldn’t that be what he would say?”
Harry replies: "He would probably say all sorts of different things.”
This story is based off a translated version of Prince Harry ’s book Spare.
