Britney Spears spent a month after her album The Woman In Me sold more than two million copies in the United States.
In a statement shared by People, the pop star said, "My book has officially sold over 2 million copies in the US!!!"
"Thank you to all the fans who supported me and my story. I love you all !!!" he added.
A press release issued by Gallery Books revealed that combined sales figures for Spears' bombshell memoir in hard cover, audiobook and ebook formats.
Earlier, the singer's highly anticipated album topped the New York Times bestseller list after selling more than a million copies in its first week of sales.
In the memorial, the "Toxic" actor talked about some of the challenges he faced, including the 13 years of immunity imposed on him in 2008, which ends in November 2021.
Spears spoke about the #FreeBritney viral movement, her mental health struggles and her troubled relationship with Justin Timberlake.
Speaking to PEOPLE, the singer said, "It's finally time for me to raise my voice and speak, and my fans deserve to hear directly from me."
He said: "No more lies, no more lies - I have my past, present and future."
Meanwhile, the anniversary has been printed for the fifth time with 1.65 million copies.
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Britney Spears is over the moon
Britney Spears is over the moon after reaching major memoir sales milestone
Britney Spears reaching major memoir sales milestone