A bonkers conspiracy theory claims that Prince William should not be the heir to the throne because he actually has an older sister.

The nuts yarn reckons that when Princess Diana was just 19, the Late Her Majesty the Queen got her to have gynaecological tests done to ensure she would bring her eldest son an heir.

It then goes on to claim that, during the tests, Diana’s eggs were harvested and fertilised with Charles’ sperm.

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The bizarre story goes that the engagement between the two wasn’t announced until the test had been carried out.

According to the grim and nonsensical tale, a “rogue doctor” held back one of these fertilised eggs and implanted it into his unsuspecting wife.

His missus then became an unwitting surrogate for the ‘royal baby’, the biological first born of Charles and Diana who would, under the Succession to the Crown Act 2013, be the rightful heir to the throne.

The alleged baby was born on October 1981, around 10 weeks after Charles and Dina married on July 29 that year.

William was born around eight weeks later, on June 21, 1982 at St Mary’s Hospital, Paddington, in the Lindo Wing.

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The girl, who would now be around 38, is said to be called Sarah.

She allegedly claimed to be described as a ‘dead ringer’ of Diana and, following the deaths of her parents in a car crash, discovered she had been the product of in vitro fertilisation (IVF).

She claims that, when she tried to trace the origin of the donated embryo, she was left scary messages telling her to stop if she valued her own life.

Terrified by what had happened, the legend goes that she emigrated to America out of fear.

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