Prince Harry and Meghan Markle caused the late Queen Elizabeth II "unforgivable stress" in her final years, a new bombshell book has claimed. The couple stepped down from royal duties in early 2020, just over two years before the late Queen's death on September 8, 2022.

Since their exit from royal life, Meghan and Harry have attacked the Firm in their televised interview with Oprah Winfrey, the Duke of Sussex's bombshell memoir and their bombshell Netflix series, titled Harry & Meghan, in 2022.

The couple's Oprah interview was televised in March 2021, just weeks before the death of the late Prince Philip.

Their docuseries aired on Netflix in December 2022, just three months after the late Queen's death aged 96.

Royal expert Hugo Vickers, who has written a new book, 'Queen Elizabeth II: A Personal History', told Fox News Digital: "What I find unforgivable is the stress that Prince Harry and Meghan Markle put on the Queen in the last years of her life.

"[Harry] was doing a really good job over in England and indeed in the Commonwealth. And [Meghan] also seemed to be very committed to the Commonwealth.

"Even as an actress, before she met and married Prince Harry, she was going to African countries and undertaking humanitarian work. And obviously, she addressed the United Nations. It all looked very positive, but it wasn't to be."

The author also shared a similar sentiment in his latest book.

The couple tied the knot in 2018, before welcoming their son Prince Archie the following May.

Following their move to the US in 2020, the couple later welcomed a daughter named Princess Lilibet on June 4, 2021.