Kate Middleton was 'offended' and demanded an apology after Meghan Markle said she had 'baby brain,' Prince Harry writes in his memoir

• The Telegraph published details from Prince Harry's upcoming memoir, "Spare," on Saturday.
• According to Prince Harry, Kate Middleton demanded an apology from Meghan Markle after a 2018 phone call.

Kate Middleton demanded an apology from Meghan Markle after Meghan commented on Kate's "baby brain," according to details from Prince Harry's memoir published by The Telegraph on Saturday.

The Spanish-language version of the book was accidentally released in Spain on Thursday ahead of its official release.

In "Spare," Harry details an argument that ensued between Kate and Meghan over comments Meghan allegedly made during Kate's third pregnancy. Kate demanded an apology at a reconciliatory tea in June 2018 between the two royal couples at Kensington Palace, according to Harry's memoir, The Telegraph reports.

"You talked about my hormones. We are not close enough for you to talk about my hormones," Kate told Meghan, according to Harry's book. Harry shared that the Princess of Wales was holding the side of the chair so hard during the conversation that her fingers turned white.

In his memoir, Harry recounted Meghan's confusion at Kate's "offended" reaction, sharing she often spoke to her friends in the same manner. Harry writes that William allegedly pointed at Meghan and said her "rude" comment was not the way things were done in Britain. According to Harry, Meghan told William to "take your finger out of my face," The Telegraph reports.

According to Harry's memoir, the tea was set to repair a phone conversation Meghan and Kate had weeks prior to Meghan and Harry's May 2018 wedding ceremony.

Harry wrote that Meghan suggested Kate had "baby brain" during the call after Kate forgot an insignificant detail, according to the outlet. At the time, Kate was pregnant with Prince Louis.

In the same chapter, Harry writes that William and Kate moved their place cards and changed seats at Harry and Meghan's wedding. According to Harry, he and Meghan followed the American tradition of placing couples next to each other but added that William and Kate insisted couples must sit apart.

"Had it really come to this? Shouting at each other about place cards and hormones?" Harry writes in his book, according to the outlet.

The alleged altercation is one of many Harry details in his upcoming book. Harry also accused his brother of knocking him to the ground after a fight over Megan got physical. Harry also calls William his "brother and archnemesis" in the memoir.

Harry's tell-all autobiography is set to release on January 10.