Shania Twain has become only the sixth artist in US music history to have more than 20m copies of one album shipped.
Twain has become a worldwide star in recent years
Her 1997 country and western album Come on Over has been certified 20-times platinum by the US music industry.
She joins The Eagles, Pink Floyd, Billy Joel, Michael Jackson and Led Zeppelin in the exclusive club of mega-sellers.
The Eagles' Greatest Hits, released in 1976, is at the top of the list in the US, shifting more than 28 million copies in 28 years.
The Canadian singer's album debuted at number one on Billboard's Top Country Albums and at number two on the Billboard 200 chart on release.
Eleven of the 16 tracks reached Billboard's Hot Country Singles and Tracks chart, including the number one hits You're Still the One, Love Gets Me Every Time and Honey I'm Home.
ALL-TIME TOP US SELLERS
The Eagles - Greatest Hits (1976) 28m
Michael Jackson - Thriller (1982) 26m
Pink Floyd - The Wall (1979) 23m
Led Zeppelin - Led Zeppelin IV (1971) 22m
Billy Joel - Greatest Hits (1985) 21m
Her track Forever And For Always was named country song of the year by the US performing rights agency BMI last month.
The song was the most-performed country track of the year on US radio and TV.
It was Twain's fourth song of the year award from the organisation, which collects licence fees on behalf of its performers and songwriters.