Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaTrump to counter DNC with travel to swing states Biden strikes out with Harris, the least-worst of his choices Biden, Harris to address Democratic convention from Chase Center in Delaware 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 TrumpUPS, FedEx shut down calls to handle mail-in ballots, warn of 'significant' problems: report Controversial GOP Georgia candidate attempts to distance from QAnon Trump orders TikTok parent company to sell US assets within 90 days 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 ObamaMcGrath reshuffles campaign in home stretch to Senate election The Hill's Campaign Report: Trump hedges with Post Office funding | Harris speaks with 19th | An apology of sorts in Massachusetts Jared Kushner denies Trump 'promoting' questions about Kamala Harris MORE.

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