Former royal butler, Grant Harrold, has lifted the lid on the sweet royal family friendship that Kate Middleton, the Princess of Wales, and Prince Harry once shared, before the latter stepped down from his senior working life in the fold and jetted off to California with Meghan, Duchess of Sussex.

In Grant's new book, The Royal Butler: My Remarkable Life of Royal Service, he details how not only were Prince William and Prince Harry extraordinarily close ahead of the family fallout, but that Kate and Harry would also hang out together one-on-one without William on occasion.

“[Prince William and Kate Middleton] involved him [Harry],” Grant writes in an excerpt published by The Telegraph. “He used to go out with Kate. William would be away, and Kate and Harry would be off doing stuff together.”

As for exactly what the royal pair got up to during their hangout sessions, it's said they enjoyed shopping or visiting the pub—much like any other pals on a day off.

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“I think when people say, ‘Oh [Harry] was left out’ he really wasn't, but also, he was with Chelsy,” Grant continues, reflecting back on a time where the two Princes and Kate often carried out joint royal engagements as a trio, and when Harry was still dating his former girlfriend, Chelsy Davy (who he first got together with in 2004 and split from in 2011).

“Chelsy was always around, and Chelsy and Kate got on really well.”

Elsewhere, Prince Harry served as Best Man at William and Kate's wedding in 2011, and reportedly delivered a speech so touching and full of affection towards the future Queen Consort, she shed a little tear.

With reports that Meghan recently sent a bottle of wine to Queen Camilla on her birthday, perhaps there's hope for a reunion in future.