Adele's "21" is top-selling U.S. iTunes album of 2012

British singer Adele notched another accolade on Thursday as iTunes announced that her Grammy-winning album "21" was the top-selling record of 2012 in its U.S. store, extending the disc's successful run almost two years after it was released.

Adele, 24, who last year became the first artist to secure three iTunes milestones with top-selling album, single and artist of the year, came in ahead of country-pop star Taylor Swift's "Red" and British folk band Mumford & Sons' "Babel."

ITunes did not reveal its sales or download figures.