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 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, Harry reportedly recounts how Kate was upset - but Meghan apologised and explained that is how she speaks to her friends.

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.