Music
The singer held off competition from Elbow and R.E.M, who debut at number two and three respectively with their albums Build A Rocket Boys! and Collapse Into Now.
Falling four positions each, Rihanna's Loud and Jessie J's Who You Are are now at numbers six and seven.
Failing to debut in the top 10, Avril Lavigne's Goodbye Lullaby enters the chart at number 12. Meanwhile, The Commitments official soundtrack jumps 84 places to number 13.
Other new entries this week come from Noah & The Whale at number 17 with Last Night On Earth and Lupe Fiasco's Lasers at number 27.
This week's top 10 in full:
1. (1) Adele: '21'
2. (*) Elbow: 'Build A Rocket Boys!'
3. (*) R.E.M: 'Collapse Into Now'
4. (6) Bruno Mars: 'Doo-wops & Hooligans'
5. (5) Adele: '19'
6. (2) Rihanna: 'Loud'
7. (4) Jessie J: 'Who You Are'
8. (8) Imelda May: 'Love Tattoo'
9. (7) Imelda May: 'Mayhem'
10. (9) Justin Bieber: 'My World
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