The Woman in Me by Britney Spears came out on October 24. Photo: Gallery Books/TNS

The book has already flown off the shelves, with over 400,000 copies being sold thus far.

Spears reportedly went through periods where she had no desire to write – let alone finish – penning the memoir, though she was ultimately persuaded to do so by best pal and manager Cade Hudson, as sources told the outlet. Hudson even got a nod in the acknowledgement of the book.

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The pop icon’s reluctance might have had something to do with the “heart-wrenching” experience she had revisiting the moments laid out in the book.

Britney Spears attends the 29th Annual Glaad Media Awards at the Beverly Hilton Hotel in April 2018, in Beverly Hills, California. Photo: Getty Images/TNS

Earlier this month, Simon & Schuster Audio announced that Spears would only read the intro of the audiobook, with the rest voiced by five-time Oscar nominee Michelle Williams.

“This book has been a labour of love and all the emotions that come with it,” Spears said in a statement to People at the time. “Reliving everything has been exciting, heart-wrenching, and emotional, to say the least. For those reasons, I will only be reading a small part of my audiobook.”

Pop superstars Britney Spears (right) and then-boyfriend Justin Timberlake (left) talk as they sit courtside at the NBA All-Star Game in 2002 in Philadelphia. Photo: AFP
In the days leading up to the book’s publication, several excerpts dropped. Among the most notable were Spears recounting the abortion she had while dating Justin Timberlake as well as the emotional ramifications of her 13-year-long conservatorship – which was terminated two years ago next month.