January 5, 2023 | 10:12am

King Charles made “sadistic” jibes astir Prince Harry’s “real” father, the prince reveals in his caller memoir.

Harry, 38, grew up amid nationalist speculation that his existent begetter was Princess Diana’s erstwhile person Major James Hewitt.

The prince writes successful his new book, “Spare,” out Tuesday, however Charles seemingly enjoyed making hurtful comments astir his parentage.

In 1 segment, seen by Page Six, Harry writes: “Pa liked telling stories, and this was 1 of the champion successful his repertoire. He’d ever extremity with a burst of philosophizing … Who knows if I’m truly the Prince of Wales? Who knows if I’m adjacent your existent father?

“He’d laughter and laugh, though it was a remarkably unfunny joke, fixed the rumor circulating conscionable past that my actual begetter was 1 of Mummy’s erstwhile lovers: Major James Hewitt. One origin of this rumor was Major Hewitt’s flaming ginger hair, but different origin was sadism.”

prince harry and king charlesThe Duke of Sussex makes the shocking allegation successful his upcoming memoir, “Spare.”Getty Images

Harry said that tabloid readers loved the thought that his dada was not truly Charles, insisting it likely made them consciousness amended astir their ain lives. “Never caput that my parent didn’t conscionable Major Hewitt until agelong aft I was born,” helium adds.

It’s conscionable 1 of the bombshells successful Harry’s book, successful which helium besides breaks his soundlessness connected his stepmother, Camilla Parker Bowles, and astir his fractured narration with his older brother, William.

He tells however William hit him during a fight implicit Harry’s aboriginal wife, Meghan Markle — and however they urged their begetter not to wed Camilla.

Diana, the princes’ mother, infamously had a five-year matter with Hewitt aft gathering him astatine a meal enactment successful 1986, and their fling went connected to marque planetary headlines. Hewitt became a arguable fig successful the UK for his attempts to merchantability emotion letters helium exchanged with the precocious princess, and helium was labeled “Britain’s biggest cad.”

In 2019, writer Anna Pasternak, who co-wrote the publication “Princess In Love” with Hewitt, addressed an facet of the affair.

prince harry, princess diana and king charlesThere had been rumors that Princess Diana’s pal was Harry’s existent father. Getty Images

“Hewitt was regularly bundled into car boots [trunks] and driven to Kensington Palace erstwhile their matter ensued,” the writer wrote successful the Daily Mail. “He told maine helium was terrified the archetypal nighttime helium stayed successful Kensington Palace, relieved astatine slightest that Charles and Diana had abstracted bedrooms.”