James is a a public school boy that pretends he’s from the street

Petra, 30, said Stunt was a “monster” and towards the end of their six-year marriage he had “taken to wearing a full face of make up” and was telling friends he was Prince Philip’s illegitimate son.

The couple, said to have a £5.5billion fortune, divorced in 2017, after reaching a financial settlement.

Petra, who has sole custody of her three children by Stunt, 37, is now engaged to car salesman Sam Palmer and they are expecting their first child.

In her series of Instagram posts, she said: “Myself and the children are so lucky to now have a real father/partner in our lives – a man who doesn’t want peopl people to think he is rich or famous but who just cares about us. I just wish Ja James would leave us alone.”

She said her father, former F1 boss Be Bernie, 89, had only ever tried to help Stu Stunt. She added: “James convenient ently forgets the £10m my Dad loaned him to fund his failed Gold business, Stunt and Co. I guess he won’t be getting that back anytime soon.”

It was reported this month that 17 paintings, including works by Monet, Dali and Picasso, loaned by Stunt to Prince Charles to display in Dumfries House in Scotland were copies.

And Petra said her ex was not the billionaire he claimed to be. She said: “Let’s shatter the James Stunt myth. The man is not a billionaire and never was.

“Naively I funded his life for our entire marriage and paid for his cars, his watches, his art (the few real ones) even his failed company, Stunt and Co.

“James always had such a sick obsession with money and being perceived to be an independently successful billionaire. The trouble is he spent most of his days in bed, high on prescription drugs.”

Stunt’s godfather is Terry Adams, a crime boss who was jailed for seven years in 2007 for money laundering.

But Petra said her ex was no gangster. She said: “He’s a public school boy that likes to pretend he is from the street and related to gangsters.

“He’s not. He’s just a prat.”