Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama to present Lin-Manuel Miranda with the Portrait of a Nation Prize Michelle Obama thanks her high school for naming new athletic complex after her US ambassador to Germany calls out journalists who blocked him on Twitter MORE’s new memoir, “Becoming,” is officially the fastest-selling book of the year at retailer Barnes & Noble.

The bookseller announced that the memoir has had the best first week of sales in 2018, The Washington Post reported Monday.

“We knew ‘Becoming’ was going to be one of the biggest books of the year, but it has now officially had the best first week of sales of any book in 2018, and is among the fastest sellers in Barnes & Noble history,” the company’s senior director of merchandising, Liz Harwell, told the Post.

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“This is definitely the must-have book of the holiday season,” Harwell added.

The Post noted that the book's sales might not be reflected across all retailers.

The book, which was released last week and sold over 725,000 copies on its first day of sales, reveals new details about Obama’s time in the White House, her marriage and her views on President TrumpDonald John TrumpO'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms Objections to Trump's new immigration rule wildly exaggerated MORE.

“Becoming” also had more presales than any other book in the last three years, according to the Washington Post. It was released just two months after journalist Bob Woodward’s book, “Fear: Trump in the White House,” broke a 93-year first-day sales record for publisher Simon & Schuster, with 750,000 copies sold.

The former first lady is currently in the early dates of a multicity book tour, and has already been joined onstage by Oprah Winfrey and, in a surprise appearance, her husband former President Barack ObamaBarack Hussein ObamaDick Cheney to attend fundraiser supporting Trump reelection: report Forget conventional wisdom — Bernie Sanders is electable 2020 Democrats fight to claim Obama's mantle on health care MORE.

Winfrey selected “Becoming” as her new book club pick for this year.