UPDATED 4/12: After last night's sell-out talk at London's Southbank Centre, Michelle Obama reportedly had a 'power meeting' with The Duchess of Sussex, who was in attendance at the Royal Festival Hall.

The Evening Standard reported that the pair discussed their shared causes such as boosting girls’ education.

A friend who was also at the event said Meghan 'had a long private audience with Michelle.

They spoke at length about the importance of supporting and empowering women across all cultures and communities. They also talked about shared experiences of pregnancy and raising children, plus shared causes including girls’ education.'

The friend also added that the duchess and Mrs Obama had formed a strong bond and were expected to stay in close contact.

We absolutely can't wait to see what plans this powerful duo are cooking up.

Meanwhile, during Obama's sell-out talk to promote her new autobiography Becoming, she recalled feeling anxious about royal etiquette ahead of her and President Obama's last visit to Windsor Castle, when they were picked up by the Queen and Prince Philip in their car.

When Obama visited the Queen at Buckingham Palace in 2009, she accidentally committed a royal faux-pas by greeting the monarch with hug. While this is widely considered to be a misstep when meeting Her Majesty, the former First Lady has now revealed that the Queen herself had told her not to worry about protocol.

President Obama And The First Lady Lunch With The Queen and Prince Philippinterest
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The Obamas visited the Queen and Prince Philip at Windsor in April 2016

'Of course your head is spinning because first of all I'm trying not to fall, which is a major thing that I think about in public,' the former FLOTUS told author Chimamanda Ngozi Adichie, the Daily Mail reports. 'If you're thinking about my thoughts when I come out on stage it's "don't fall".

'One of my primary goals for the eight years was to never become a meme,' Obama added. '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... 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".'

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Michelle Obama on stage at the Southbank Centre

Speaking about the bond between the former President and the royals, Obama also revealed how the Queen reminds her husband of his grandmother.

'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. He is a huge fan for sure,' she said.

US President Barack Obama (L) and his wipinterest
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Meeting the Queen at Buckingham Palace in 2009

Obama's book, Becoming, has become one of the fastest-selling memoirs of 2018 since its release in November. It sold 750,000 copies on its first day and, according to The Associated Press, more than 1.4 million copies were picked up in its first week.

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BUY NOW Becoming, by Michelle Obama, £12.50

In it, Obama shares one the more relatable conversations she had with the Queen back in 2009, when she admitted to the monarch that her feet were hurting. She writes: 'Forget that she sometimes wore a diamond crown and that I'd flown to London on the presidential jet; we were just two tired ladies oppressed by our shoes.'