Royal biographer Omid Scobie has been slammed by commentator Tonia Buxton, following the release of his latest royal book Endgame.
The biography, released today, details several new claims against many members of the Royal Family, including the Prince and Princess of Wales.
Scobie said in the book that critics had called Princess Kate "lazy", and accused her of "avoiding regular royal duties" shortly after her wedding to Prince William.
Another passage claims the Princess of Wales "jokingly shivers" when Meghan Markle's name is mentioned.
Endgame claims Princess Kate is 'technically a part-time working royal'
Further allegations said Princess Kate is "technically a part-time working royal" and the monarchy's "last shiny thing for many years to come".
Scobie wrote that the Princess "does not plan to increase her workload for 10-15 years" when her children have grown up.
Reacting to the claims, Buxton labelled them "lies", and came to the defence of the Princess of Wales.
Buxton stated: "Kate is an elegant woman who was aware of what it would mean to become queen, to be Princess of Wales, and she stepped into that role elegantly and has done it beautifully and stoically."
Buxton fumed: "They're trying to twist that into something else, it's disgusting. It is misogynistic, absolutely is misogynistic.
"She's taken her job seriously. She's following in the footsteps of the Queen. Taking this job and her duty very seriously and doing a fantastic job of it.
"And what this he's trying to do is to make her look some like some kind of puppet. Like she doesn't have a brain. She's a mother of three, and I think she's absolutely brilliant.
"Making up nicknames, we all made-up nicknames, we called her 'weighty Katie' for a while, and now they're calling her 'Keen Katie' or 'Katie Keen' or whatever it is. But what she is actually is, is practising to be Queen Kate."
Tonia Buxton said the claims against Princess Kate are 'misogynistic'
GB News presenter Bev Turner then asked panellist Nigel Nelson if the "punches will land against the Royal Family", or if it will "galvanise people to be in more support of them".
Nelson said: "I would rather hope that people wouldn't buy the book on the on the basis of what we've seen, but we'll see.
"But obviously what the author was doing was actually trying to make it so sensational and that's why these things sell at the moment. I would have thought that this is where Harry really does have to make a statement.
"I think you ought to say that neither he nor his circle had any input into this book whatsoever and he doesn't recognise any of the claims made in it. That would be the best thing for him, otherwise the suspicion is he's always behind it somewhere."