According to a royal expert, Prince Harry will bitterly regret ‘selling’ his family by writing a new book, just like his late mother Princess Diana did.

Ingrid Seward, a royal author, stated that the Duke of Sussex disclosing intimate information about his past “cannot be a good idea.” Ms Seward went on to say that Harry’s memoir “may well come back to haunt him” and negatively affect the Queen.

She went on to say that, just as Princess Diana regretted publishing hers, so will Harry.

According to Ingrid, writing in The Sun, “revealing personal details of such a public royal life as Harry’s cannot be a good idea.”

“It may well come back to haunt him, especially if it upsets his grandmother and then he changes his mind about what he has said,” she added.

Princess Diana’s 1992 book, Diana Her True Story with Andrew Morton, made international headlines – and she subsequently stated that it should never have been released.

“Diana regretted doing her book, so she said.

“She certainly regretted making millions for everybody else out of her own sad revelations.

Ingrid then pondered on how Prince Harry may have justified authoring the book – and how his mother’s memories could have been a driving reason behind it.

She said: “I imagine Harry’s excuse is that his mother did it. She wrote the book, she did the interview and she complained about her treatment by the royal family. But as much as he might want to, Harry will never have the power and compassion his mother once had.”

The book is Harry’s latest money-making endeavour since quitting the royal family and migrating to California.

Harry recently announced that he is working on his book, which will be published by Penguin Random House in 2022.

She also stated that she believes Diana would be “incredibly sad” if Prince Harry felt compelled to write the book.

“This could be the worst mistake of Harry’s life,” Ingrid speculated. “We know he hates those inaccuracies written about him, but it is part of life in the spotlight and will never go away.”

Prince Harry chose JR Moehringer as his “power ghostwriter” for his book, whereas Diana chose Andrew Morton for Diana: Her True Story.

Moehringer promises a “wholly truthful and accurate” account of his life and Megxit when it is released around Christmas or early in the New Year.

Senior royals were apparently only notified about the book a few minutes before its announcement.

The Queen has yet to speak officially about Prince Harry’s memoir intentions. Despite speculations of recent friction between the Sussexes and the Royal Family in the aftermath of the couple’s shocking Oprah appearance, the Queen reaffirmed that they are “much loved family members”

“Ever since leaving royal life, Harry and Meghan have made claim after claim of how they allege they have been treated,” a source previously told the Mirror.

“They say that it is their truth but there is only ever one truth.

“Since their interview with Oprah Winfrey tensions have been running very high as much of what they said has since been proven to be unreliable at best.

“There is a now tsunami of fear among the royals over what Harry will write.

“Many hope he may correct a few things but do not hold much hope.”

Harry emphasized that he was writing the biography “not as the prince I was born but as the man I have become”