The singer released her second disc, 21, in January (11) and, boosted by a show-stopping performance at the Brit Awards in February and the worldwide success of lead single Rolling in the Deep, it enjoyed a long run in charts on both sides of the Atlantic.
Now sales figures for the year show 21 has shifted 5.28 million copies in the U.S. alone - the highest annual sales since R&B star Usher's Confessions in 2004.
Lady Gaga's much-hyped Born This Way trails Adele with sales figures of 2.03 million, while Michael Buble's festive album Christmas sold 1.96 million copies.
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