Lady Gaga's 'The Fame Monster' was the biggest selling album of 2010.
The 'Telephone' singer's record - a repackaged version of her earlier disc, 'The Fame,' with an additional eight tracks - sold 5.8 million copies across the globe, according to the United World Chart, compiled by website mediatraffic.de.
Upon hearing the news Gaga tweeted, writing: "'The Fame Monster' was named the best-selling album of 2010!
"I'm so excited for the future, believe work hard, you will achieve your dreams (sic)."
The eccentric singer's album beat Eminem, who's 'Recovery' sold 5.7 million copies to land him in second place on the chart, while Canadian teen singing sensation Justin Bieber came in third with 5.6 million sales of his 'My World' albums.
Gaga also said she will be making an announcement about her new album 'Born This Way' at midnight on New Year's Eve.
Meanwhile, the singer has been defended by John Lennon's widow, Yoko Ono, after fans of her ex-husband's band The Beatles criticized Gaga for playing a piano belonging to the star.
Yoko told the Daily Mail newspaper: "I think her playing John's piano was wonderful. Because she's an artist, she's fearless and she pushes every limit, which we both always adored."
United World Chart top 20, as complied by mediatraffic.de:
1. Lady Gaga - The Fame (Monster) - 5.8 million copies
2. Eminem - Recovery - 5.7 million copies
3. Justin Bieber - My Worlds - 5.6 million copies
4. Lady Antebellum - Need You Now - 3.6 million copies
5. Taylor Swift - Speak Now - 3.5 million copies
6. Susan Boyle - The Gift - 3.0 million copies
7. Black Eyed Peas - The E.N.D. - 3.0 million copies
8. Michael Buble - Crazy Love - 3.0 million copies
9. Sade - Soldier Of Love - 2.3 million copies
10. Alicia Keys - The Element Of Freedom - 2.3 million copies
11. Katy Perry - Teenage Dream - 2.2 million copies
12. Take That - Progress - 2.2 million copies
13. Susan Boyle - I Dreamed A Dream - 2.1 million copies
14. Ke$ha - Animal - 2.1 million copies
15. Rihanna - Loud - 2.0 million copies
16. Mumford and Sons - Sigh No More - 1.8 million copies
17. Kings Of Leon - Come Around Sundown - 1.7 million copies
18. Bon Jovi - Greatest Hits - 1.7 million copies
19. Usher - Raymond V Raymond - 1.7 million copies
20. Linkin Park - A Thousand Suns - 1.7 million copies