Meghan Markle secretly attended Michelle Obama's talk at London's Southbank Centre

Meghan Markle secretly attended Michelle Obama's talk at London's Southbank Centre

During a recent talk on her book tour for Becoming, the former First Lady said the philosophy of "leaning in", which was popularized by Facebook COO Sheryl Sandberg, is "a lie".

Michelle Obama, the former U.S. first lady, has said she still feels imposter syndrome despite her eight years as America's most powerful woman and her success as an advocate for women and girls across the world.

"I feel vulnerable all the time", she tells Winfrey. The crowd of course went wild with Obama realness and the tongue slip.

Becoming, is about Obama's life from her childhood, growing up on the Southside of Chicago, through her historic White House years.

While the Obamas have a seemingly ideal marriage, the forever FLOTUS admitted it takes hard work to keep it going.

"Marriage still ain't equal, y'all", Mrs. Obama told some 19,000 audience members on Saturday.

"I'll always be grateful for the opportunity that living in the White House afforded us", she said about the little sleep she got, adding, "But it probably won't come as a surprise to anyone that sometimes it was a real challenge to keep up with the pace". Both professionally and personally, she is an idol to so many of us, but in her book, she details how she and Barack Obama went to marriage counseling, and she spoke at Barclays about finding balances of power.

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"When a woman starts thinking about having children, Sandberg said, 'she doesn't raise her hand anymore".

"Malia and I were talking recently about all the little things we'd stress over in junior high and high school - whether we're wearing the right clothes, a snarky comment somebody made about us, the boys we crushed on", she says. "It is hard. I love my husband, and we have a great marriage, and we've had a great marriage, but marriage is hard work". As part of her visit, she took 40 or so of its pupils to Oxford University.

"People are like, 'Oh, why'd she talk about marriage counselling?'" she continued.

Obama said that marriage should be hard work, given it involves two independent individuals coming together to build a life forever - also, she was blunt about how kids can cause havoc on a relationship. "And so, overall, we are not seeing a major increase in female leadership in any industry or in any government in the world, and I think that's a shame".

"As much as I wish that could happen in four years, I don't think that's a likely time period", said Sandberg.

Her advice to the Duchess of Sussex is simple: don't rush.