Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaJulián Castro: No one can ‘out-gutter’ Trump The Hill’s 12:30 Report: Day 27 of the shutdown | Cohen reportedly paid company to rig online polls, boost his own image | Atlantic publishes ‘Impeach Donald Trump’ cover story Ex-Michelle Obama aide says O'Rourke's road trip is a 'listening tour' in form of a travel blog MORE's memoir, "Becoming," sold 3.4 million copies in 2018 and was the best-selling hardcover book of the year, The New York Post reported Tuesday.

Approximately 712,000 copies of Obama's book, which was released in November, were sold the week before Christmas, according to the Post, citing stats from NPD Bookscan, which tracks about 80 percent of the retail market.

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The Post reported that political books "Fire and Fury: Inside the Trump White House," by Michael Wolff, and "Fear: Trump in the White House," by Bob Woodward, also ranked as top-10 selling books in 2018.

NPD Bookscan announced in late November that the former first lady's book had sold 2 million copies, more than any other book published in the U.S. in 2018.

Obama embarked on a book tour to promote her memoir last year, sitting down with celebrities and engaging with audiences at arenas around the country and internationally.

The memoir covers her childhood, her career, her time in the political spotlight and her thoughts on the election of President TrumpDonald John TrumpSunday shows preview: Shutdown negotiations continue after White House immigration proposal Rove warns Senate GOP: Don't put only focus on base Ann Coulter blasts Trump shutdown compromise: ‘We voted for Trump and got Jeb!’ MORE.