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Meghan Markle, the Duchess of Sussex, privately attended Obama's book tour stop at London’s Southbank Centre, and spoke with the former first lady afterward, Kensington Palace confirmed.
The meeting is believed to be the first between Markle — a native of California — and Obama, who has been on tour promoting “Becoming" since its Nov. 13 release.
Obama had tea with Prince Harry at Kensington Palace in 2015. And just last year, Harry and Obama surprised students at a Chicago school — Harry had traveled to Chicago for the inaugural summit of the Obama Foundation.
Prince Harry and his brother, Prince William, both made visits to the White House during the Obama administration.
In 2016, Obama joined forces with Harry to headline the opening ceremony of the Invictus Games in Orlando. That same year, Michelle and Barack Obama visited Kensington Palace at the invitation of Harry, William and his wife, Kate.
With Meghan in the audience at Tuesday's book event, Michelle Obama shared a story about a 2016 visit with Harry's grandmother, Queen Elizabeth II.
Michelle Obama recalled the protocol that she was told to follow when she and Barack Obama made their last offiial visit to Windsor Castle in 2016. The former first couple was told they were going to land at the castle in Marine One and then be driven by the Queen, according to the British Press Association.
"People are talking to other people and then you're briefed, and you're told, 'This is going to happen and don't stand there and don't touch there and this is precisely what is going on,'" Michelle Obama said.
"So I had all this protocol buzzing in my head, and I was like 'don't trip down the stairs and don't touch anybody, whatever you do,'" she added. "And so the Queen says, 'Just get in, sit wherever,' and she's telling you one thing and you're remembering protocol and she says, 'Oh it's all rubbish, just get in.'"
Obama also spoke in her onstage interview with author Chimamanda Ngozi Adichie about the controversy after she touched Queen Elizabeth on the back during a reception at Buckingham Palace in April 2009.
"I touched her," she said Monday. "After all those protocol lessons, I was human."
Michelle Obama, who served eight years as the first lady, said the former president is also a fan of 92-year-old Queen Elizabeth.
"Barack is so incredibly fond of Her Majesty and I won't go into his fangirling, but I think it's because she does remind him of his grandmother Toot — she's smart and funny and honest," she said. "He is a huge fan for sure."
Michelle Obama's event on Monday was the first stop on her European book tour for "Becoming," which is the bestselling book of 2018.
Michelle Obama canceled the next two stops in Europe — Paris and Berlin — in order to travel back to the U.S. to attend the funeral of former President George H.W. Bush.
It’s important to me to join the Bush family in celebrating President George H.W. Bush’s exemplary life. This will unfortunately preclude my visits to Paris and Berlin. I’ve been deeply touched by the enthusiasm for my memoir, and I’m working to reschedule my trip for next year.— Michelle Obama (@MichelleObama) December 2, 2018