PRINCESS Diana once made her sons "promise to be best friends" and "never let anyone come between them" her psychic pal has revealed.
Simone Simmons, who Diana used to consult before her death, said William and Harry vowed to keep their mum's wish - giving her a big hug to seal the deal.
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Ms Simmons is quoted in an updated edition of Robert Lacey's Battle of Brothers, in which she says 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.'"
But despite vowing to never let anyone come between them, Robert Lacey revealed William “went ballistic” at claims Meghan bullied Palace aides.
The Duke of Cambridge is said to have confronted his younger brother in a “fierce and bitter” bust-up.
And Palace insiders say a “dossier of distress” was assembled into the alleged bullying.
It's understood that the brothers have called a truce for the unveiling of a statue dedicated to Diana, which Harry will fly back for on July 1.
The pair are due at Kensington Palace in London for the momentous occasion — their first meeting since Prince Philip’s funeral and what would have been their mother's 60th birthday.
The Princes will leave the Palace together, walk to the statue and then deliver their own speeches.
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But a source said this week: “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.”