Experts are now debunking long-held theories suggesting Prince Harry is not the son of Prince Charles and was instead fathered by one of Diana's ex-lovers.

Other conspiracy theorists think that Prince Harry is the son of Diana and her ex-lover James Hewitt rather than Prince Charles. Despite Hewitt's denial, the accusation arose from suspicions that Diana met Hewitt while still married to Prince Charles.

Hewitt and Diana reportedly started dating in 1986, when he was assigned to teach the Princess riding lessons as part of the Household Cavalry. Their relationship is said to have lasted till 1991.

Rumors that Hewitt was Prince Harry's real father began to swirl after Princess Diana confirmed and made public their relationship in 1995. However, the most crucial denial came from Hewitt, who maintained that he had never seen Diana until she became pregnant with Prince Harry in 1984.

A photographer uploaded a 1957 photograph of the late Prince Philip, Prince Harry's grandfather, showcasing their resemblance, which helped discredit the scheme.

Last year, even Sarah Ferguson, Prince Harry's aunt, and Prince Andrew's ex-wife, spoke out against the claims, stating she was "sick of hearing the accusations that James Hewitt is Prince Harry's biological dad." Diana, Sarah Ferguson's sister-in-law, was a close friend.

Last year, images emerged showing Prince Harry's likeness to Prince Phillip, who died last year, according to The Daily Star. When sharing a 1957 issue of the Paris Match Magazine with Prince Philip on the cover, grinning in his navy uniform, a photographer couldn't believe the Duke of Edinburgh's likeness to Prince Harry.

According to The News, Princess Diana allegedly had an affair with Hewitt in 1986 after asking him to be her horse-riding instructor. She died in a car accident in 1997. Their hidden friendship grew as suspicions spread that her husband, Charles, was having an affair with Camilla Parker-Bowles, whom he would eventually marry. 

On BBC Panorama in 1995, Princess Diana acknowledged having an affair with Hewitt. Prince Charles was widely suspected of cheating on Diana with his current wife, Camilla Parker-Bowles, at the time of the tragedy. When Hewitt was deployed to serve in the Gulf War, the couple was forced apart, and they eventually divorced after their adultery was exposed in the public. After splitting up in 1992, Princess Diana and Prince Charles divorced four years later.

James Hewitt is a retired household cavalry officer from the British Army. The 62-year-old was born in Northern Ireland's Derry, but grew up in Kent and Devon before attending Millfield School in Somerset, one of the country's most prestigious public schools.

In 1978, he was commissioned as a second lieutenant into the Life Guards, a senior army regiment, after attending the Royal Military Academy Sandhurst. In 1991, he was a Challenger tank commander in the Gulf War, but he failed three important promotion exams. Hewitt retired from the Army in March 1994 after 17 years of service and opened a golf driving facility, according to The Scottish Sun.

Prince Harry Visits Nottingham [Representational image] NOTTINGHAM, ENGLAND - OCTOBER 26: Prince Harry waves as he leaves Nottingham's new Central Police Station on October 26, 2016 in Nottingham, England. Joe Giddins - WPA Pool/Getty Images