Princess Diana once made her two boys promise to "never let anyone come between them", her psychic friend has claimed.
Simone Simmons, who the Prince of Wales used to consult before her passing, said William and Harry vowed to "be best friends" and keep their mum's wish.
She says they gave her a big hug to seal the deal.
Robert Lacey discusses Ms Simmons' recollection in an updated edition of his book, the Battle of Brothers, where Diana told the boys: "You must promise me that you will always be each other’s best friends.
"And never let anyone come between you."
Royal historian Lacey goes on to write: "Both boys promised they would keep to that, Simmons remembers.
"They high-fived each other and gave their mother a big cuddle.
"‘Anybody would have melted at the sight,’ recalls Simmons.
"Then they went out to play soccer.'"
However, reports of a rift between the royal siblings have been highlighted over the past year, and Prince Harry referred to the 'space' between him and William when he sat down to talk with Oprah Winfrey with his wife Meghan Markle.
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The Duke claimed that his dad Prince Charles and brother were 'trapped' in The Firm, but he and his family moved to the US.
The 36-year-old later told the US host in their Apple docuseries, The Me You Can't See, that his father passed on 'pain and genetic suffering' onto himself and Prince William from his own upbringing with the Queen and Prince Philip.
Prince Harry 'could bring Archie back during UK trip to call truce with royals'
It's understood the brothers have called a truce for the unveiling of a statue dedicated to Diana, which Harry will return to the UK for on July 1.
The pair are due at Kensington Palace in London for the occasion, and it'll be their first meeting since Prince Philip's funeral.
The event is in honour of their late mother to mark what would have been her 60th birthday.
The princes will leave the palace together, walk to the statue and deliver their own speeches after the unveiling.
It comes after a source claimed their relationship is still 'very strained'.
The insider claimed: “Harry and William have only communicated by text since the Duke of Edinburgh’s funeral.
"There have not been any personal chats or proper talks, just a very brief and minimal exchange of text messages.
“The relationship is still very much strained and there’s no sign yet that there will be any sort of coming together any time soon.”
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