• A tell-all book on the Sussexes says Prince Harry and his cousin Princess Eugenie were the "closest of friends"
  • Princess Eugenie was one of the first royals to know about Prince Harry and Meghan Markle’s relationship
  • The couple's decision to announce their pregnancy during Eugenie's wedding did not go down well, the book claims

Prince Harry and Princess Eugenie have always shared a close bond, and she is one of the people he trusts “implicitly,” a new Sussex biography revealed.

"Finding Freedom: Harry and Meghan and the Making of a Modern Royal Family," a tell-all book authored by royal reporters Carolyn Durand and Omid Scobie, delves into Prince Harry and Meghan Markle's exit from the royal family and their relationships with other family members.

The book released Tuesday said that Prince Harry and Princess Eugenie have always been more than just cousins — they are also the "closest of friends."

"Out of all the Queen's grandchildren, Harry and Eugenie have one of the most natural connections. Like Harry, Eugenie is loyal, honest, and great fun. The two had many nights out together in London," the authors wrote.

The biography also revealed that Prince Harry has always confided in Princess Eugenie about the women in his life.

"Not only did he trust her implicitly, but friends say that she gives great advice and has always been 'beyond wise' for her years," the authors wrote.

Princess Eugenie was supposedly one of the first to know about Prince Harry’s relationship with Markle, and according to the book, she believed the actress was "just the tonic" for her cousin. The younger daughter of Prince Andrew and Sarah Ferguson was "nothing but encouraging about his new relationship" and told friends she loved Markle.

The strong relationship between the duo’s mothers — the late Princess Diana and Ferguson — only brought Harry and Eugenie closer.

"Like Harry, Eugenie also struggled to carve out his own identity growing up," the authors wrote. "Not being a senior role meant that she had to go out into the world and find her own path, which she had done."

But the Sussexes’ decision to announce their pregnancy during Princess Eugenie and Jack Brooksbank's wedding in October 2018 did not go down well with Prince Harry's younger cousin. The book revealed that Princess Eugenie told friends Prince Harry and Markle could have waited to share the news.

Excerpts from the book were made available before its release, and it has already received a lot of criticism. Royal correspondent Roya Nikkhah believes the new tell-all will be hurtful to the Queen.

A representative for Markle and Prince Harry, however, confirmed that the Duke and Duchess of Sussex did not participate in the making of "Finding Freedom."

"The Duke and Duchess of Sussex were not interviewed and did not contribute to 'Finding Freedom,'" the Sussexes' spokesperson said. "This book is based on the authors’ own experiences as members of the royal press corps and their own independent reporting."

Britain's Prince Harry and Meghan Markle
Britain's Prince Harry and Meghan Markle are bowing out entirely from representing the monarchy. AFP/Daniel LEAL-OLIVAS