With thanks to Oldbloke on UKMIx:
Quote:
“Top 10 albums in the US so far (2012).
Rank - Sales - TITLE - Artist
01 - 2,266,702 - 21 - Adele
02 - 596,900 - THE GREATEST HITS - Whitney Houston
03 - 487,628 - NOW 41 - Various
04 - 335,808 - TAKE CARE - Drake
05 - 314,038 - A DIFFERENT KIND OF TRUTH - Van Halen
06 - 310,254 - 19 - Adele
07 - 290,005 - OWN THE NIGHT - Lady Antebellum
08 - 286,705 - MYLO XYLOTO - Coldplay
09 - 280,183 - 2012 GRAMMY NOMINEES - Various
10 - 228,072 - EL CAMINO - Black Keys”
5.8 million total in 2011? I can't see her NOT beating that this year TBH. That total up there is only 150k off the total for the second best selling US album of 2011. We are only half way through March FGS

My gut feeling is '21' will be in the Top 5 of best selling US albums of all time list by year end. Thanks to blackandblue from UKMix for this list:
The 50 Best-Selling Albums of the SoundScan Era
[Week Ending February 26, 2012] NB '21' is now up to #38.
TW Pos (TW var) RTD - Title - Act (last update) - TW Sales % Change LW Sales
..1 ( = ) 15,752,609 Metallica - Metallica (26/02/2012) 2,270 -10% 2,523
..2 ( = ) 15,513,000 Come on over - Shania Twain (01/01/2012)
..3 ( = ) 14,714,000 Jagged little pill - Alanis Morissette (01/01/2012)
..4 ( = ) 12,168,000 Millennium - Backstreet Boys (01/01/2012)
..5 ( = ) 12,025,539 1 - The Beatles (26/02/2012) 9,551 +37% 6,978
..6 ( = ) 11,901,530 The bodyguard (OST) - Whitney Houston (26/02/2012) 46,920 +176% 17,025
..7 ( = ) 11,772,000 Supernatural - Santana (01/01/2012)
..8 ( = ) 11,574,000 Human clay - Creed (01/01/2012)
..9 ( = ) 11,122,000 No string attached - 'N Sync (01/01/2012)
10 ( = ) 10,803,361 Come away with me - Norah Jones (26/02/2012) 1,795 -47% 3,356
11 ( = ) 10,790,000 Falling into you - Céline Dion (01/01/2012)
12 ( = ) 10,682,523 Legend - Bob Marley and The Wailers (26/02/2012) 3,880 -7% 4,190
13 ( = ) 10,563,066 The Marshall Mathers LP - Eminem (26/02/2012) 3,550 -11% 3,970
14 ( = ) 10,556,897 ...Baby one more time - Britney Spears (22/05/2011)
15 ( = ) 10,300,000 Cracked rear view - Hootie & The Blowfish (01/01/2012)
16 ( = ) 10,143,000 Titanic - Soundtrack (25/09/2011)
17 ( = ) 10,116,000 Backstreet Boys - Backstreet Boys (02/10/2011)
18 ( = ) 10,043,683 The Eminem show - Eminem (26/02/2012) 1,956 -14% 2,271
19 ( = ) _9,962,457 Confessions - Usher (26/02/2012) 2,520 -17% 3,043
20 ( = ) _9,928,569 Hybrid theory - Linkin Park (26/02/2012) 1,768 -12% 2,019
21 ( = ) 9,926,457 Ten - Pearl Jam (26/02/2012) 2,232 +5% 2,127
22 ( = ) 9,571,000 Ropin' the wind - Garth Brooks (02/11/2008)
23 ( = ) 9,557,680 Let's talk about love - Céline Dion (26/02/2012) 2,213 -27% 3,033
24 ( = ) 9,281,186 The dark side of the moon - Pink Floyd (26/02/2012) 3,513 +2% 3,450
25 ( = ) 9,202,039 Oops! ...I did again - Britney Spears (22/05/2011)
26 ( = ) 9,152,083 Greatest hits - Bob Seger/Silver Bullet Band (26/02/2012) 3,947 -9% 4,355
27 ( = ) 9,072,939 Devil without a cause - Kid Rock (12/04/2009)
28 ( = ) 9,010,000 No fences - Garth Brooks (02/11/2008)
29 ( = ) 8,947,470 Nevermind - Nirvana (26/02/2012) 2,304 -5% 2,432
30 ( = ) 8,766,000 'N Sync - 'N Sync (05/10/2008)
31 ( = ) 8,724,000 Hell freezes over - The Eagles (22/05/2011)
32 ( = ) 8,713,000 Wide open spaces - Dixie Chicks (22/05/2011)
33 ( = ) 8,573,000 II - Boyz II Men (05/10/2008)
34 ( = ) 8,489,000 Country grammar - Nelly (30/01/2011)
35 ( = ) 8,289,000 Fly - Dixie Chicks (02/11/2008)
36 ( = ) 8,214,171 Christina Aguilera - Christina Aguilera (22/05/2011)
37 ( = ) 8,142,423 Tragic kingdom - No Doubt (22/05/2011)
38 ( = ) 8,086,000 Yourself or someone like you - matchbox 20 (05/10/2008)
39 ( = ) 8,082,000 Dookie - Green Day (15/01/2012)
40 ( = ) 8,080,319 Get rich or die tryin' - 50 Cent (26/02/2012) 1,973 -3% 2,040
41 ( = ) 8,037,381 Breathless - Kenny G (05/10/2008)
42 ( = ) 8,036,328 Journey's Greatest hits - Journey (26/02/2012) 4,187 -12% 4,772
43 ( = ) 7,968,000 All the way... A decade of song - Céline Dion (11/09/2011)
44 ( = ) 7,948,837 Greatest hits - Tom Petty/Heartbreakers (26/02/2012) 2,304 -8% 2,506
45 (+1) 7,821,368 The lion king - Soundtrack (26/02/2012) 1,798 +144% 736
46 ( -1) 7,821,000 The hits - Garth Brooks (11/09/2011)
47 ( = ) 7,690,487 O brother, where art thou? - Soundtrack (26/02/2012) 3,909 +127% 1,719
48 ( = ) 7,661,419 The woman in me - Shania Twain (22/05/2011)
49 (+9) 7,649,158 21 - Adele (26/02/2012) 296,549 -59% 729,900
50 ( -1) 7,620,462 Daydream - Mariah Carey (26/02/2012) 1,308 -24% 1,723