Singer Britney Spears' memoir The Woman Inside Me sold 1,1 million copies in the US alone in its first week.
"I poured my heart and soul into the memoir, and I am grateful to my fans and readers around the world for their unwavering support," Spears said in a statement released by Simon & Schuster.
Sales data includes pre-orders, print, e-book and audio book sales.
The Woman in Me, released on October 24, has been praised by critics as a compelling account of her rise to global fame and her current struggles, including a guardianship that has given her father control over many aspects of her life for years and the revelation that she had an abortion while was in a relationship with Justin Timberlake more than 20 years ago.
On the day of its release, Spears announced on Instagram that her book was the "best-selling celebrity memoir in history." It is not, so far, even the best-selling memoir of 2023.
"The Woman Inside Me," which Spears hasn't promoted much outside of Instagram, was last week's top seller. But Prince Harry's memoir, which was published in January, sold 1,6 million US copies in its first week.
Spears' memoir has helped boost streaming and sales across her music catalog, according to Luminate, a music and entertainment analytics company. In one day last week, Monday through Tuesday, Spears' catalog jumped 18,2 percent in on-demand streams and 36,8 percent in album sales.
The numbers continued to rise in the following days. According to Luminet, its streams in the US increased by 24 percent compared to the previous Sunday - from 16 million to 19,8 million; her album sales increased by 61,4 percent, and digital by 49 percent.
A similar case was recorded in September 2020, when Mariah Carey released "The Meaning of Mariah Carey" - an increase of 28,6 percent during the week of publication.
The audio edition of "The Woman in Me," read by Oscar-nominated actress Michelle Williams, appears to be a key factor in the book's initial popularity. Her reading of "The Woman in Me" is highly regarded, and according to the label, it is the fastest-selling audio release in the company's history. The publisher did not immediately announce a specific figure for audio sales.
According to data from the company Circani, which tracks about 85 percent of the print market, "The Woman in Me" sold just under 418.000 copies, which is far below the number for the first Sunday of former President Barack Obama's "Promised Land" and "Becoming" of the former first ladies Michelle Obama.
Neither edition, however, comes close to the scale of Harry Potter and the Deathly Hallows, by J.K. Rowling, which was released in 2007 and sold more than eight million copies in the first 24 hours.