Prince Harry claims that King Charles joked "who knows if I'm even your real father?" during rumours that the Duke of Sussex was the son of Princess Diana and her ex-lover Major James Hewitt.
In his new tell-all book, Spare, Prince Harry delves into his past while discussing his mother Diana's affair with Major Hewitt.
The book, which is not due out in the UK until January 10, was accidentally released today in Spain.
