Going on to explain that the incident which started the rift was in her upcoming book, the author teased: “I can’t repeat it exactly, it’s in the book, but what I can say is, something happened at the very first garden party at Buckingham Palace.”

She continued: “We were all absolutely gobsmacked and astonished, we all thought this doesn’t bode well”.

Meghan and Harry: The Real Story is set to be released on July 28.