Kate Middleton Makes Prince William a Better Man, William’s Biographer Writes
The Duke of Cambridge will turn 40 this month.


It’s Prince William who will one day be king, but it’s his wife Catherine, the Duchess of Cambridge, who has helped him become more relatable and is his most trusted adviser, royal expert Robert Jobson says.
Lest we forget, in addition to the milestone celebrations of the Platinum Jubilee—marking Her Majesty’s historic 70 years on the throne—June will bring about another milestone in the royal family: William’s fortieth birthday on June 21.
To mark the occasion Jobson, a longtime royal reporter, has penned William at 40: The Making of a Modern Monarch, out June 9 in the U.K. and July 25 in the U.S. In the book, Jobson praises Kate for her positive influence, writing “as crisis followed crisis, smiling Catherine hasn’t put a foot wrong.”
Since meeting William as freshmen at the University of St. Andrews in Scotland in 2001—she was first his friend, then his roommate, then his girlfriend before getting engaged in 2010 and marrying in 2011—Kate’s confidence has grown over time, Jobson says. “Every step of the way, Catherine has put duty first,” he says, per The Sun. And, beneath her soft smile, there’s “a tigress, passionate about her husband and a modern woman who will fight tooth and nail for her family.”
In addition to her own growth, Kate has made William a better man, Jobson says.
“With Catherine at his side, the prince seems more assured, their chemistry clear for all to see,” he says. “Her influence over William, whose presentation in the past used to be somewhat stiff and a little nervy, has helped him become more relatable, to be more himself. His sense of humor and warmth is now visible.”
We’ve seen Kate and William together constantly this weekend, on the balcony for Trooping the Colour, at the Service of Thanksgiving for the Queen at St. Paul’s Cathedral, in Wales to visit Cardiff Castle, and at the Platinum Party at the Palace.
Stay In The Know
Get exclusive access to fashion and beauty trends, hot-off-the-press celebrity news, and more.
“Not only is she William’s most trusted adviser, she is someone who puts family and duty above all else,” Jobson writes.

Rachel Burchfield is a writer, editor, and podcaster whose primary interests are fashion and beauty, society and culture, and, most especially, the British Royal Family and other royal families around the world. She serves as Marie Claire’s Senior Celebrity and Royals Editor and has also contributed to publications like Allure, Cosmopolitan, Elle, Glamour, Harper’s Bazaar, InStyle, People, Vanity Fair, Vogue, and W, among others. Before taking on her current role with Marie Claire, Rachel served as its Weekend Editor and later Royals Editor. She is the cohost of Podcast Royal, a show that was named a top five royal podcast by The New York Times. A voracious reader and lover of books, Rachel also hosts I’d Rather Be Reading, which spotlights the best current nonfiction books hitting the market and interviews the authors of them. Rachel frequently appears as a media commentator, and she or her work has appeared on outlets like NBC’s Today Show, ABC’s Good Morning America, CNN, and more.
-
Gigi Hadid Pairs Metallic Track Pants and Mesh Flats
The controversial shoe trend is most definitely gaining steam.
-
Body Language Expert Says Kate Can't "Mask Her Emotions"
"We also saw William...mirroring the same emotions as Kate."
-
Kate Middleton's Earrings Pay Tribute to Queen Elizabeth II
Catherine made sure the late monarch's presence was felt at the prestigious event.
-
Body Language Expert Reveals Kate Middleton Can't "Mask Her Emotions" at Trooping the Colour 2025
"We also saw William...mirroring the same emotions as Kate."
-
Kate Middleton's Trooping the Colour Outfit Features a Special Tribute to Queen Elizabeth II
Catherine made sure the late monarch's presence was felt at the prestigious event.
-
Yes, Prince Louis and Prince George Are Having a Ball at Trooping the Colour 2025
Their matching outfits are simply the icing on the cake.
-
Kate Middleton and Princess Charlotte Showcase Their Mother-Daughter Style at Trooping the Colour 2025
The little princess twinned with her mom in the best way.
-
Kate Middleton Channels Princess Diana in a Catherine Walker Coat Dress at Trooping the Colour 2025
The Princess of Wales even wore the same designer as her late mother-in-law.
-
This Vintage Clip of Kate Middleton Apologizing to Prince William After Beating Him in a Boat Race Is Going Viral on TikTok
"We were sabotaged," Will joked after Kate beat him not once, but twice.
-
The "Cheeky" Joke Prince William Made Referencing a Former Queen at Formal Windsor Castle Event
The Prince of Wales was speaking to 'Bad Sisters' star Anne-Marie Duff at the time.
-
How Prince George and Prince William's "Shared Passion" Made a Windsor Castle Event "Extra Special" for One Attendee
The father and son duo have made quite the impact.