Kate Middleton is 'indispensable' to royal family as slimmed-down monarchy faces mounting pressure: expert

Kate Middleton has become one of King Charles' most beloved family members, with one royal expert calling her the "monarchy's greatest asset."

The claim came from Vanity Fair royal correspondent Katie Nicholl, co-host of "The Royals Uncensored." After more than 20 years covering the royal family on tours and engagements, Nicholl said she has spoken to countless palace insiders, many of whom are enchanted by the Princess of Wales.

"I think Catherine, the Princess of Wales, has always been a very valuable asset to the royal family," Nicholl told Fox News Digital. "She is the commoner who married into the royal family ... [She has made] a seamless transition into that unique world of royalty. It's not easy ... There's a huge amount of sacrifice that goes into being a member of the royal family."

PRINCE WILLIAM, KATE MIDDLETON FINALLY FEEL FREE TO SHOW AFFECTION IN PUBLIC: EXPERTS

King Charles III kisses Catherine, Princess of Wales, after the Requiem Mass for the Duchess of Kent at Westminster Cathedral in London on Sept. 16, 2025. Royal experts told Fox News Digital the touching moment reflects the increasingly close relationship the monarch shares with his daughter-in-law. (Jordan Pettitt - Pool/Getty Images)

"Catherine's had to give up a huge amount, and yet she does it all with a great deal of grace and dignity, always with a smile," Nicholl said. "So she is absolutely the monarchy's greatest asset."

Nicholl also noted that "the king adores her, and the queen adores her."

Catherine, Princess of Wales speaks with children during an official welcome at the Town Hall on the first day of her visit to Reggio Emilia on May 13, 2026, in Reggio Emilia, Italy. (UK Press via Getty Images)

Royal experts told Fox News Digital that Charles and Kate have forged an even deeper bond since both were diagnosed with cancer. Buckingham Palace announced the king's diagnosis in 2024. In December 2025, Charles shared the "good news" that his treatment would be scaled back in 2026.

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Just weeks after the king's announcement, Kate revealed in March 2024 that she was undergoing treatment for an undisclosed form of cancer. She completed chemotherapy that September and announced in January 2025 that she was in remission.

British broadcaster and photographer Helena Chard told Fox News Digital that the king, 77, had been greatly inspired by the Princess of Wales' strength.

Catherine, Princess of Wales, Princess Charlotte of Wales and King Charles III during Trooping the Colour on June 15, 2024, in London. (Karwai Tang/WireImage)

"King Charles sees enormous value in Princess Catherine," Chard said. "Not just as the wife of his heir, but as the cornerstone of the monarchy itself. He genuinely loves his 'darling' daughter-in-law. His face lights up when he is with her. They share similar interests, and they have shared a similar cancer journey, one that has created a deep bond and understanding that goes beyond duty."

King Charles III and Catherine, Princess of Wales, are seen here at the state banquet for German President Frank-Walter Steinmeier and his wife, Elke Budenbender, at Windsor Castle in Windsor, England, on Dec. 3, 2025. (Aaron Chown - Pool/Getty Images)

Chard argued that it hasn't just been Charles who quickly realized that Kate represented the monarchy's future.

"The late queen saw it too," Chard said. "She recognized Catherine's superpowers early on — her ability to listen, find solutions and bring calm to difficult situations."

Queen Elizabeth II, England's longest-reigning monarch, died in 2022 at age 96. (Geoff Pugh)

"King Charles fundamentally views his time on the throne as stewardship," she said. "He sees himself as the caretaker of the institution and is acutely conscious of preparing the next generation. Collaborative preparation between the king and his heir is essential. Having Princess Catherine as the wife of his heir, Charles has struck gold."

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Prince William, Prince of Wales, Catherine, Princess of Wales, Princess Charlotte, Prince George and Prince Louis watch an RAF flypast from the balcony of Buckingham Palace after attending Trooping the Colour 2026 on June 13, 2026, in London. (Max Mumby/Indigo/Getty Images)

Royal author Sally Bedell Smith previously told People magazine that Kate is "like the daughter he never had."

"He has always had a very strong bond with her," Smith told the outlet. "He shares with William an impulse to protect her. They are in this together, Kate and the king."

Kate Middleton and the former Prince Charles examine artwork produced on silk during a visit to the Dulwich Picture Gallery on March 15, 2012, in Dulwich, south London, England. (John Stillwell - WPA Pool/Getty Images)

When Kate made her diagnosis public, Buckingham Palace said Charles was "so proud of Catherine for her courage in speaking as he did."

Catherine, Princess of Wales congratulates patient Claire Lorente and her partner, Pablo, as she rings the end-of-treatment bell at the Christie cancer care hospital in Manchester, England, on June 4, 2026. (Andy Stenning - WPA Pool/Getty Images)

Author Christopher Andersen previously wrote in his book "Kate!" that the king was by Kate's side "to lend his cherished daughter-in-law moral support" during her health battle.

Kate's advocacy work following her cancer diagnosis continues, Nicholl told Fox News Digital.

Catherine, Princess of Wales curtseys to King Charles III on Sept. 16, 2025, in London. (Max Mumby/Indigo/Getty Images)

"Thankfully, despite a serious health issue, she has overcome that," Nicholl said. "We've just seen her climb the three highest peaks in the United Kingdom to raise money for the Royal Marsden. She's turning her experience into something positive, and I think that's earned her a great deal of respect among the British public, along with a lot of love and affection. People are very much behind her and William."

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Catherine, Princess of Wales, is seen visiting Evelina London Children's Hospital in London, on July 6, 2026. (Anadolu via Getty Images)

Chard echoed those sentiments.

"Princess Catherine connects with people in a way that restores faith in the monarchy," Chard said. "She has learned every aspect of the institution over many years and has blended in carefully without fuss. Princess Catherine is central to the institution's success, and King Charles knows this."

With a slimmed down monarchy, Charles needs key allies now more than ever. His younger brother, Andrew Mountbatten-Windsor, stepped back as a working royal in 2019 following his controversial ties to late convicted sex offender Jeffrey Epstein. Charles has since formally removed Andrew’s princely title and HRH style.

Andrew Mountbatten-Windsor was arrested on Feb. 19, 2026, and released after about 11 hours under investigation. He was detained on suspicion of misconduct in public office over allegations that he shared confidential trade reports with Jeffrey Epstein while serving as the U.K.'s trade envoy. (Max Mumby/Indigo/Getty Images)

In 2020, Prince Harry and Meghan Markle, the Duke and Duchess of Sussex, stepped back as senior working royals and later settled in California.

From left: Prince William, Kate Middleton, Prince Harry and Meghan Markle attend a ceremony to mark the centenary of the Royal Air Force on the forecourt of Buckingham Palace on July 10, 2018, in London. The Duke and Duchess of Sussex stepped back as senior royals in 2020. (Max Mumby/Indigo/Getty Images)

"Princess Anne and other senior working royals are all stretched thin — and none of them are young," author Catherine Mayer previously told People magazine. "William and Catherine carry the whole thing."

Sources told the outlet there had been "even greater attention and expectation on the Waleses." Still, royal experts told Fox News Digital that Kate is well-positioned to support the king.

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Queen Camilla, Prince William, King Charles and Kate Middleton are seen at the "No Time To Die" world premiere at the Royal Albert Hall in London, on Sept. 28, 2021. (Max Mumby/Indigo/Getty Images)

"Naturally, King Charles recognizes the value of Kate, who is indeed the monarchy's greatest asset," Richard Fitzwilliams told Fox News Digital. "We should add, 'together with her partnership with William and their family.' While we praise Catherine's many strengths, William is the future king. She will one day be queen consort. They see themselves as a close-knit couple."

"William is currently at the center of reports that he and the king differ over how to handle Prince Harry, in particular," Fitzwilliams said. "As she showed when the Sussexes met with the king and Queen Camilla, she fully supports William's approach."

Catherine, Princess of Wales, speaks to guests during a Cancer Research UK reception marking the charity's 125th anniversary at St. James's Palace on June 2, 2026, in London. (Jonathan Brady - Pool/Getty Images)

As William and Kate prepare for their future roles, they are likely to remain under close public scrutiny. With Charles' support, royal experts believe the couple is well-positioned for the years ahead.

Prince William is heir to the British throne. (Aaron Chown - Pool/Getty Images)

"It’s not at all surprising King Charles and Princess Catherine have bonded," British royals expert Hilary Fordwich told Fox News Digital. "One can tangibly feel the public also values her wonderful assets from the reception she always receives when in public, as well as in opinion polls. She has become indispensable and has won the public’s trust."

"Charles can depend on Catherine because she is consistent, steady and modern in her approach to family, shaped by her upbringing and dedication to duty," Fordwich said. "She handled the strain of her cancer battle with dignity, without any indication of self-pity."

Catherine, Princess of Wales cools down with a fan as she attends Day 14 of the 2026 Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 12, 2026, in London. (Karwai Tang/WireImage)

"One can observe from the body language between Charles and Catherine that they are so comfortable together, derived from the time they spent together during their cancer battles."