The 'Someone Like You' star claimed the top two positions on the rankings this week after her debut LP 19 climbed back to the runner-up spot from last Sunday's four.
Adele's sophomore collection has now added another record to its wealth of achievements, beating Lady GaGa's benchmark for the most digital sales in the UK.
The 'Poker Face' singer became the first artist to break the 300,000 digital sales barrier in March with 2008 release The Fame, while 21 has shifted 320,000 downloads in just two months.
Martin Talbot of the Official Charts Company said: "Adele's 21 has achieved in just two months what took Lady GaGa's The Fame over two years. This really is a coming of age for digital album sales."
The highest new entry of the week belongs to London band The Vaccines, who finished third behind Jessie J and James Blake in the BBC Sound Of 2011 contest, and their debut LP What Did You Expect From The Vaccines? at four.
Right behind are The Overtones, who rocket 31 places up the chart with Good Ol' Fashioned Love after featuring in the Dancing On Ice quarter-final, and last week's runners-up Elbow, down to six with Build A Rocket Boys!.
The top ten is rounded out by veteran performers Daniel O'Donnell and Michael Ball, as the former steps two places to nine with Moon Over Ireland, and Ball arrives just after with Heroes, the 16th top 40 album of his 27-year career .
Further down the list sees R.E.M's Collapse Into Now plummet eight places to 13 from last week's five, while Bread And Circuses, the third studio LP by The View, is a new entry at 14.
Also crashing to the back end of the top 20 are Avril Lavigne and Mumford & Sons, who are down eight and seven places respectively with Goodbye Lullaby and Sigh No More at 17 and 19.
The top ten in full:
1. (1) Adele: '21'
2. (4) Adele: '19'
3. (3) Jessie J: 'Who You Are'
4. (-) The Vaccines: 'What Did You Expect From The Vaccines?'
5. (36) The Overtones: 'Good Ol' Fashioned Love'
6. (2) Elbow: 'Build A Rocket Boys!'
7. (6) Rihanna: 'Loud'
8. (7) Bruno Mars: 'Doo Wops & Hooligans'
9. (11) Daniel O'Donnell: 'Moon Over Ireland'
10. (-) Michael Ball: 'Heroes'
Source: Official Charts Company
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