Ms Junor told the Times: “She has got such poise and elegance and she’s not in competition with William.
“She doesn’t seem to be seeking fame. Everything about her is measured.
“She’s a grown-up. She seems to care a lot about everything she’s put her name to.”
Kate and William met while studying at St. Andrew’s University in Scotland between 2001 and 2005.
In 2007, the couple took a break from each other for a few months.
Later in 2010, when the couple announced their engagement in an interview, William said: “We were both very young, it was at university. We were both finding ourselves as such and being different characters and stuff.
“It was very much trying to find our own way and we were growing up, it was a bit of space and a bit of things like that and it worked out for the better.”
Since their royal wedding, the Cambridges had three children together – Prince George, seven, Princess Charlotte, five, and Prince Louis, three.
According to royal expert Camilla Tominey, Kate is “carving her own path as she prepares to be the next Princess of Wales”.
In a short video, Ms Tominey previously told The Telegraph: “I think when the time comes, Kate will use that title and so comparisons are automatically going to be made with Princess Diana.
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“And of course they’re very big shoes to fill and I think that’s why Kate if you like has tried to beef up over recent years her own individual commitment to the crown.
“That means not being in her husband’s shadow but doing her own thing.
“The closet comparison might be a sort of first lady to presidential role in that Kate wants her own office, her own advisers and her own pathway to follow in addition to that of being in union with Prince William.”