Prince Harry is set to open up on his life inside and outside the royal family in an emotional memoir called Spare.

The news has been confirmed by Penguin Random House, who announced that the presumably-explosive book will be released on 10 January 2023.

A spokesperson for the publishing house wrote: "SPARE takes readers immediately back to one of the most searing images of the twentieth century: two young boys, two princes, walking behind their mother’s coffin as the world watched in sorrow—and horror.

"As Diana, Princess of Wales, was laid to rest, billions wondered what the princes must be thinking and feeling—and how their lives would play out from that point on.

"For Harry, this is his story at last.

"With its raw, unflinching honesty, SPARE is a landmark publication full of insight, revelation, self- examination, and hard-won wisdom about the eternal power of love over grief."

The book title seems to reference the saying 'heir and a spare'. Credit: Penguin Random House

Markus Dohle, Global CEO of Penguin Random House globally, said: “Penguin Random House is honoured to be publishing Prince Harry’s candid and emotionally powerful story for readers everywhere.

“He shares a remarkably moving personal journey from trauma to healing, one that speaks to the power of love and will inspire and encourage millions of people around the world."

Prince Harry has already confirmed that the proceeds from the book - which seems to make reference to the 'heir and a spare' saying about the children of royalty - will be donated to charity, including donations that have already been announced to vulnerable children in Lesotho and Botswana that have been affected by HIV and AIDS, as well as a £300,000 donation to WellChild, a UK-based charity for seriously ill children.

Explaining this decision, Penguin Random House wrote: “Prince Harry wishes to support British charities with donations from his proceeds from Spare.

“The Duke of Sussex has donated $1,500,000 to Sentebale, an organisation he founded with Prince Seeiso in their mothers’ legacies, which supports vulnerable children and young people in Lesotho and Botswana affected by HIV/AIDS.

“Prince Harry will also donate to the non-profit organisation WellChild in the amount of £300,000.

"WellChild, which he has been Royal patron of for fifteen years, makes it possible for children and young people with complex health needs to be cared for at home instead of hospital, wherever possible.”

Harry's memoir will discuss his life inside and outside the Royal Family. Credit: Sipa US/Alamy

Harry is described in his author biography as a ‘husband, father, humanitarian, military veteran, mental wellness advocate, and environmentalist’.

“He resides in Santa Barbara, California, with his family and three dogs," the blurb concludes.

With the book being scheduled for release the day after his sister-in-law Kate, the Princess of Wales' birthday, the book will certainly cause a stir on both sides of the Atlantic.

You'd have to imagine that the other members of the royal family will be interested in getting their mitts on a copy as well.

Especially Harry's father, the now-King Charles.