SHOCKING: Kate Middleton and Prince William Expecting a ‘FOURTH BABY’ – THE TRUTH THAT WILL LEAVE EVERYONE STUNNED!

Kate Middleton is said to be such a major influence on her husband Prince William that she treats him “like her fourth child.”

The claim was made by royal author Tom Quinn, who has written a new book, “Yes Ma’am: The Secret Life of Royal Servants.” Quinn spoke to hundreds of former and current palace staff members to learn what it’s like to watch over the House of Windsor.

Fox News Digital reached out to Kensington Palace, which represents the offices of the Prince and Princess of Wales, for comment. A spokesperson for Buckingham Palace previously told Fox News Digital, “We don’t comment on such books.”

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Kate Middleton has been married to Prince William, heir to the British throne, since 2011. They share three children. (Aaron Chown – Pool/Getty Images)

“Occasionally, William has little tantrums and irritations if things aren’t done the way he wants them done [as heir to the British throne],” Quinn claimed to Fox News Digital.

“But Kate is very good at managing that in the same way that she manages the tantrums of their three children – Prince George, Princess Charlotte and Prince Louis. And so, there’s a joke among the staff that Kate treats William as the fourth because he occasionally behaves like one.”

Prince William embraces his wife following a polo match. (Max Mumby/Indigo/Getty Images)

According to the book, a member of staff told Quinn, “I don’t know where William would be without Kate – she hasn’t had everything done for her throughout her life, so she calms him down when he gets a bit fractious. She says he sometimes has to be treated as her fourth child!”

Tom Quinn’s book, “Yes, Ma’am: The Secret Life of Royal Servants,” is available now. (Biteback Publishing)

The insider claimed that Kate’s non-royal upbringing makes her easygoing to work with, and a favorite among staff, in comparison to William and his father.

“Suits must be pressed and laid out after a period of consultation the night before; shoes must be polished, ties chosen,” a staff member claimed to Quinn in his book about looking after King Charles III and his heir.

Royal author Tom Quinn claimed that King Charles and his heir, Prince William, are prone to temper tantrums. (Pool/Max Mumby/Getty Images)

“Baths must be run at precisely the same time each day and both King Charles and the Prince of Wales, Prince William, are prone to tantrums if things are not done to their liking,” the aide claimed, as quoted in the book.

Kate Middleton and Prince William wave following the coronation of King Charles III and Queen Camilla at Westminster Abbey on May 6, 2023. (Max Mumby/Indigo/Getty Images)

“’They both get irritated very quickly,’” a former member of staff claimed, adding that the king and his heir are used to having things done for them, making them “very picky.”

“People who have everything done for them from childhood tend to be rather spoiled and prone to bouts of irritation because they have no idea how much work is involved in washing and ironing, polishing and sewing when they have never done any of it themselves,” the aide claimed, as quoted in Quinn’s book.

Kate Middleton recently returned to her royal duties after announcing in January that she was in remission. The Princess of Wales was diagnosed with cancer in 2024. (Max Mumby/Getty Images)

The future king may get moody when things don’t go his way. Kate is reportedly not fazed by his behavior.

The former Prince Charles, Queen Elizabeth II, Prince Louis, Kate Middleton, Princess Charlotte, Prince George and Prince William watch a flypast from the balcony of Buckingham Palace during Trooping the Colour on June 2, 2022, in London. The queen passed away in September of that year. (Max Mumby/Indigo/Getty Images)

“In many ways, William has had an emotionally damaging childhood,” Quinn explained to Fox News Digital. “I don’t just mean because his mother, Princess Diana, died when he was 15, which is enormous in itself. Everyone could understand that that was very damaging to him.

“But before that, the split between his parents was very public. All the unpleasantness between his parents was played out on the world stage. Meanwhile, he was looked after by paid staff.”