The shocking 1995 interview rocked Kensington Palace when the beloved princess spoke candidly about Charles’s affair with Camilla Parker Bowles.
But Wills – then 13 and boarding at posho private school Eton College – was furious that his mum had blabbed about the family drama on TV.
Royal biographer Penny Junor revealed the sad state of the second-in-line, and revealed he was “devastated”.
In the book Prince William: Born to be King, she said: “He wouldn’t speak to her afterwards and when he came home all hell broke loose.
“He was furious that she hadn’t told him what she was going to do.
“Furious that she had spoken badly of his father, furious that she had also mentioned James Hewitt.”
Diana had an affair with the ginger army officer between 1986 to 1991.
Simone Simmons, in biography Diana: The Last Word, said: “He (Wills) hated the idea of everything being on TV and knew his friends would poke fun at him, which they did.
“He felt she had made a fool of herself, and him.