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Princess Diana Once Told Prince William & Prince Harry 'That You Will Always Be Each Other's Best Friends,' Author Claims

Princess Diana once told Prince William and Prince Harry 'that you will always be each other's best friend,' royal author Robert Lacey claims in an updated version of his book.

Princess Diana always wanted what was best for her two sons, Prince Harry and Prince William.

In an updated version of Robert Lacey's Battle of Brothers book, Diana reportedly told her boys: "You must promise me that you will always be each other’s best friends. And never let anyone come between you."

Simone Simmons, Diana's psychic and friend, said Harry and William "promised they would keep to that."

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"They high-fived each other and gave their mother a big cuddle. Anybody would have melted at the sight. Then they went out to play soccer," Lacey wrote.

William and Harry haven't been on the best terms in the past few months, but now the boys will reunite on July 1 at Princess Diana's statue unveiling.

“There have been conversations, after Lili was born and to make plans for next week," a mutual friend said of the situation. "But things are still very strained."

“They know the eyes of the world will be on them — watching their every move — so what you will see is a carefully choreographed show of unity for that day, at least," a source said.

Kate Middleton is even stepping in to try and diffuse the tension.

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"The Duchess has seen this project evolve from its conception and now to the finished article and undoubtedly wants to be there to support her husband," a source shared with The Mirror. "No doubt there will be tensions between the Cambridges and Harry, but they all recognize that despite the obvious and deep rooted issues between them, they want the day to be solely about the Princess of Wales’ enduring legacy."

Harry and William commissioned the statue in 2017, but it has been delayed over the years. Finally, the two will get to see the work of art come to light.

"It has been 20 years since our mother’s death and the time is right to recognize her positive impact in the U.K. and around the world with a permanent statue," they previously said in a statement. "Our mother touched so many lives."