The Queen met her great-granddaughter Lilibet for the first time in what appeared to be a secret meeting inside Windsor Castle as Prince Harry and Meghan reunited with the Royal Family.
Royal commentator Omid Scobie, one of the authors of the Duke and Duchess of Sussex's biography Finding Freedom, revealed details of the low-key introduction during a TV interview this morning.
He said that last night would have been the first time the monarch would have met her namesake, who turns one on June 4, in person, the Mirror reports.
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The news comes as the Queen celebrates the second day of her Platinum Jubilee today, with the highlight of a service of thanksgiving at St Paul's Cathedral attended by senior royals and politicians - although Her Majesty won't be there after she experienced "discomfort" on Friday.
Wider members of the family are also expected to be present, including Prince Harry and Meghan followed by a Guildhall reception.
Mr Scobie told BBC Breakfast: "I think people are expecting some sort of big birthday extravagant event, that we're going to see photographs from. From what I'm told, we shouldn't expect anything.
"Those moments with Lilibet are very much private between them and the Queen and of course we know how much she's been looking forward to it.
"They've been held back by a pandemic. Of course the times that Harry has been here it's just been by himself for quite sombre occasions. And so this really was the first time.
"Of course we know the Queen went back to Windsor Castle yesterday, the couple went back to Windsor as well where they're staying at Frogmore Cottage.
"So that would have been the first moment or the first chance for her to meet her namesake."
He also said that Harry and Meghan hope to be as "low-profile as possible" during their trip to the UK for The Platinum Jubilee.
Mr Scobie added: "I spoke with people close to the couple... who said that they want to be as low-profile as possible during this trip.
"It's almost hard to believe, but I think yesterday Trooping the Colour was a great example. We didn't really catch sight of them on TV cameras."
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