Royal insiders have long heard wild rumours that Diana gave birth to a little girl, Sarah, who would now be in her 30s.
She is said to be older than Prince William, 36.
US tabloid GLOBE claims before Diana married Charles in 1981, the then 19-year-old was ordered by the Queen to undergo gynaecological tests to establish that she was capable of bearing children before her engagement to the heir to the throne could be announced.
The outrageous story claims that Diana’s eggs were harvested and then fertilised with Prince Charles’ sperm.
However, after the tests came back and Diana’s fertility was deemed to be healthy, instead of the embryos being destroyed, a “rogue doctor” secretly held onto them and implanted them in his own wife, making her the unwitting surrogate mother of Diana and Charles’ biological child.
Although the story has been dismissed as a preposterous rumour, the fact it’s doing the rounds again – and at a time when the limelight should be solely on Charles – has left a jealous Camilla furious.
A source close to the palace says, “Camilla can’t believe that this story has reared its ugly head again on the eve of Charles’ 70th birthday.
“She’s absolutely furious.
“Once again Diana’s name is on everyone’s lips and Camilla’s name is getting dragged through the mud. Camilla feels like she’s only just recovered from the fallout from the 20-year anniversary since Diana’s death – her popularity ratings really took a hit, and she feels like it’s happening again.”
In the implausible story about Diana’s “secret daughter”, Globe reports that the young woman named Sarah – allegedly born eight months before Prince William – is now said to be 37 and would technically be second-in-line to the throne after Prince Charles.
The magazine claims to have spoken to Sarah, who told them that when she was growing up, she was always being told that she was “a dead ringer” for Diana.
And in a further bizarre twist, it’s even claimed that Duchess Kate has secretly met up with Sarah – a rumour that will no doubt only prove to further anger a jealous Camilla.
“Everyone should be talking about Camilla and Charles’ next steps to the throne and his milestone birthday,” spills the source. “But instead it’s all about Diana and their supposed secret baby. It’s just the worst timing for this scandal.”