Markle also told Vanity Fair they were a young couple in love recently in her first comments about their relationship.
'I understand the Queen spent nearly an hour with her grandson and the Los Angeles-born Meghan, who stars in the USA legal drama Suits, ' says Kay.
Hear more on Prince Harry's relationship with Markle in the video below.
According to the insider, the Queen normally sits for half an hour eating from a selection of sandwiches, fruit or plain scones and cake.
Once assembled, the sovereign, her grandson and his girlfriend were then shared tea from 17h.
Perhaps the Los Angeles-born "Suits" actress was positioning herself as the appropriate bride for Harry by showing she has something in common with Elizabeth II.
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Reps at Kensington Palace and Buckingham Palace have not yet commented on the rumor of Markle's private tea with the queen.
While this marks Markle's first official gathering with the queen, it isn't the first time she came into contact with her potential future-in-laws.
"We're a couple", she explains.
All signs are pointing to an engagement as, in addition to this visit, Harry and Meghan made their public debut as a couple last month at the Invictus Games in Toronto. "I'm always very happy when two people who are in love decide to get married, who doesn't love a happy, romantic wedding?" The ginger prince will be pushed to sixth in line when Kate Middleton gives birth to her third child with Prince William!
The Prince has since reportedly been spotted in the Cotswolds looking for a new house for him and Meghan to move in to.
The trio had tea together and it was thought to have happened last Thursday, which will no doubt prompt royal watchers into thinking an engagement is imminent.