Former first lady Michelle Obama’s best-selling memoir is on course to become the most popular autobiography of all-time, according to its publisher.

“Becoming”, first published just five months ago, has already sold more than 10 million copies, her publisher announced in March.

German publisher Bertelsmann, which owns a 75% stake in Penguin Random House, paid $60 million for the rights to the book alongside forthcoming memoirs by former US President Barack Obama.

Michelle Obama’s book, which explores her experience from childhood, her work, motherhood, and her time in The White House, has been praised for its universal appeal across genders and ages.

In it, she reveals difficulties in her marriage with Barack, disclosing details of how the couple suffered a miscarriage and later used in vitro fertilization (IVF) to conceive both children, Malia and Sasha.

The 54-year-old also criticizes current US President, Donald Trump, writing that she can “never forgive” him for “putting my family’s safety at risk” over his championing of the “birther” theory that her husband was not born in the US and thus was not a legitimate president of the US.