You forgot Norah Jones, the first Adele All of her current sales updates are from articles about Adele's success.

Studio Albums:
1. Come Away With Me - 10,910,000 (Feb 2013)
2. Feels Like Home - 4,632,000 (May 2012)
3. Not Too Late - 1,584,000 (August 2009)
4. The Fall - 770,990 (June 2010)
5. Little Broken Hearts - 385,000 (December 2012)

Total - 18,281,990 (August 2009)

Duet Albums:
1. Here We Go Again: Celebrating the Genius of Ray Charles -
2. Foreverly - Under 100k (not sure if it counts)

Total - ~100k

Compilation Albums:
1. ...Featuring Norah Jones -

Total -

EPs:
1. First Sessions - (Under 10,000)
2. Deep Cuts -

Total -

I don't have all of her numbers, though I thought I'd share some. She definitely deserves to be on the list.

Updated Beyonce's number; she surpassed Carrie. Will keep updating hopefully

I gathered receipts of Soundscan numbers from UK Mix, Pulse Music Board and the Billboard articles I found. Here are the top 24:

1) Mariah Carey (54,209,000)
2) Celine Dion (52,129,000)
3) Shania Twain (34,250,000)
4) Britney Spears (32,709,000)
5) Reba McEntire (30,118,000)
6) Madonna (29,300,000)
7) Dixie Chicks (27,200,000)
8) Enya (26,623,000)
9) Whitney Houston (24,617,000) [Outdated Receipt]
10) Cher (22,411,000)

11) Taylor Swift (22,400,000)
12) LeAnn Rimes (21,650,000)
13) Alanis Morssiette (20,658,000)
14) Faith Hill (20,105,000)
15) Janet Jackson (20,092,931)
16) Christina Aguilera (17,650,000)
17) Alicia Keys (17,020,843)
18) Destiny's Child (17,000,000)
19) TLC (15,600,000) [Outdated Receipt]
20) Pink (15,500,000)
21) Beyonce (14,720,000)
22) Carrie Underwood (14,468,000)
23) Adele (13,300,000)
24) Kelly Clarkson (12,800,000)
25) Avril Lavigne (12,200,000)


There are so many artists under 12 million, it would be hard to remember all of them and find their sales. All I know is Rihanna is at 10 million (finally). Thanks