Prince Harry revealed Kate Middleton’s furious response to Meghan Markle’s ‘baby brain’ comment

With constant news stories, memoirs, and tell-all documentaries about the ongoing rift between Princes Harry and William, and their respective wives Meghan Markle and Kate Middleton, it's hard to imagine a time when the two couples saw eye-to-eye.

But, when Harry first introduced Meghan to his brother and sister-in-law, they got along so well that the media dubbed them the Fab Four.

Then came a series of fights in the build-up to the Duke and Duchess of Sussex's 2018 wedding that saw the start of a growing divide between the couples.

A series of arguments between Meghan Markle and Kate Middleton saw a rift grow between the pair prior to Meghan's wedding to Prince Harry (Eric Charbonneau/Archewell Foundation via Getty Images)

One now-infamous argument saw Meghan and Kate argue over bridesmaid dresses, as detailed in Harry's bombshell memoir, Spare, which was released last year.

In the book, he said that Kate had contacted Meghan four days before the wedding to say that the dresses needed remaking as Charlotte's didn't fit.

"Meg didn't reply to Kate straight away," Harry wrote. "Yes, she had endless wedding-related texts, but mostly she was dealing with the chaos surrounding her father [Thomas Markle, who had to undergo heart surgery just before the wedding]. So the next morning she texted Kate that our tailor was standing by. This wasn't sufficient.

"Meg asked if Kate was aware of what was going on right now. With her father. Kate said she was well aware, but the dresses. And the wedding is in four days!"

Meghan then snapped back: "Yes, Kate, I know..."

Harry claims the argument left his wife-to-be 'sobbing on the floor'.

Harry claims Kate was offended by a comment Meghan made about her having 'baby brain,' while Prince William called the actress 'rude' (Samir Hussein/WireImage)

But, according to the prince, that wasn't the only fight that occurred between the two duchesses.

He revealed that the women were discussing rehearsals for the wedding day, and Kate forgot some insignificant detail about their plans.

Meghan then suggested that Kate - who gave birth to Prince Louis just 28 days before the wedding - must have had 'baby brain'.

Harry wrote in Spare that Kate was offended by the comment.

When the two couples met for a reconciliatory tea after Meghan and Harry's honeymoon, Kate is said to have confronted Meghan about the comment.

According to Harry, she said: "You talked about my hormones. We are not close enough for you to talk about my hormones."

His wife was apparently confused by Kate's response and insisted that this was the way she spoke to her friends, before Will pointed at Meghan, called her 'rude' and told her his wasn't the way people in Britain behaved.

Meghan, in turn, told Will to 'take your finger out of my face'. Yikes.