Princess Diana confronted Camilla and gave her a 12-word warning after finding her with Prince Charles after they snuck off together at a party, a former royal protection officer has claimed.
Diana married the heir to the throne in a fairytale wedding at St Paul's Cathedral more than 41 years ago - with the couple having sons Princes William and Harry.
But it was later revealed that Charles had been unfaithful to his wife with the then Camilla Parker Bowles - a former girlfriend who he had dated in the 1970s.