Michelle Obama's book Becoming set to become the best-selling memoir in history after nearly 10 million copies sold

Former first lady Michelle Obama's best-selling memoir, "Becoming," has sold nearly 10 million copies, and is set to become the best-selling memoir in history.

The parent company of publisher Penguin Random House announced Tuesday.

    "We believe this could be the most successful memoir in history," said Thomas Rabe, the chief executive of Bertelsmann, a parent company of Penguin Random House, according to the Wall Street Journal.

The candid memoir, which was released in November, quickly became a best-seller and one of the most popular books in the World.

In its first week, "Becoming" sold more than 1.4 million copies, Penguin Random House said in November.