Before becoming monarch, King Charles was married to Princess Diana from 1981 to 1996 – they welcomed two sons: Prince William, 41, and Prince Harry, 39.

Since 2005, the 75-year-old has been married to Camilla Parker Bowles. They’ve never had any children.

However, one man is alleging he is the secret love child of the royal couple – and he’s trying to prove it.

British-born Simon Charles Dorante-Day, who now lives in Australia, has gone viral with his shocking claims – he’s convinced he’s the illegitimate son of King Charles and Queen Camilla.

The 57-year-old even has a Facebook page dedicated to the matter – it has over 27,000 followers.

Many of Dorante-Day’s followers are convinced by his claims, with one fan writing: “You look so like both of them, I hope you get answers soon.”

Another adds: “Definitely so much resemblance to the King and Queen. The other day I saw some recent photos/footage of Prince William and the resemblance to you is incredible.”

A third person comments: “You are a good mix of both your parents. It’s hard to deny what everyone can see. As always, I hope one day you get your answers.”

Dorante-Day has previously claimed his adoptive grandmother, who reportedly worked for the late Queen Elizabeth II, told him he was the son of the royal couple on her deathbed, per MailOnline.

He was adopted when he was around eight months old in 1966 in Portsmouth – King Charles and Queen Camilla would have been 17 and 18, respectively, at the time of his birth.

Dorante-Day alleges that in the months leading up to his birth, King Charles was sent to Australia to study and Queen Camilla disappeared from the public eye for around nine months.

The father also alleges that during his childhood, he underwent a procedure to change his eye colour and his teeth were also altered in a ‘cover-up’.

However, Dorante-Day’s claims contradict official records which state the King and Queen Camilla met each other five years after the 57-year-old’s birth.

The royal family has maintained utter silence on Dorante-Day’s allegations.

In an interview with 7News, Dorante-Day has made further claims.

He alleges that he and his wife were approached by a woman with an American accent at their Queensland home in the early hours of December 2, 2023.

The 57-year-old says they opened the door to find the older woman alongside a man who claimed to be a private investigator.

“This woman claimed that she was the secret illegitimate daughter of Prince Philip who lived in San Francisco,” Dorante-Day claims.

“She explained that she had travelled from the US after hiring an investigator to track me down in Queensland. The whole purpose of her visit was to ask me for a sample of my DNA.

“She wanted to compare it to hers to basically prove that we were both related to the royal family.”

But Dorante-Day concluded it was a scam, adding ‘the whole thing just seemed really fishy’. He was also concerned it was an ‘illegal attempt to procure my DNA’.

Dorante-Day is determined to get a paternity test from King Charles and Queen Camilla – but in the right way.

He says he’s ‘confident’ his case will come together and he’s ‘ready to prove it’. In fact, he has an extraordinary plan to compare his DNA with Prince Harry’s.

Dorante-Day claims to 7News that he and his wife have been told by a ‘trusted source’ that the Duke of Sussex could be key to helping him gather proof.

His wife explains: “We got advice from a really good, really trusted source that we should approach Harry and make a connection there and ask for DNA.”

Dorante-Day weighs in, adding: “So I’m going to make contact with him and explore this as an opportunity.

“At the end of the day, I feel like he just might be as keen as I am to expose what Charles and Camilla and the powers that be have done to me. The injustice.”

In the meantime, the 57-year-old has taken to his popular Facebook page and shared photos he believes are compelling enough to support his allegations.

Dorante-Day’s latest post to the account, on May 1, reads: “One good thing about them becoming King and Queen is that we get a lot more images to compare with, from many different angles. The more I see, the more they look like thee.

“It’s been a while since we’ve done one, even though I’ve received many!

“So many features I can trace, not just to me but to our children, and with many members of both families! The more weight Charles loses from his face the more he looks like me!”