U.S. DIGITAL SALES
CONFIRMED NUMBERS -
Womanizer - 3,500,000
Circus - 3,100,000
Till The World Ends - 2,900,000
3 - 2,300,000
Toxic - 2,200,000
Piece Of Me - 1,900,000
Gimme More - 1,810,000
I Wanna Go - 1,770,000
Hold It Against Me - 1,600,000
If U Seek Amy - 1,300,000
ESTIMATED NUMBERS + LAST CONFIRMED TOTAL -
Scream & Shout - 3,500,000 (08/13: 3,300,000)
Work Bitch - 950,000 (10/13: 410,000)
Break The Ice - 775,000 (10/13: 760,000)
...Baby One More Time - 700,000 (07/13: 585,000)
S&M (Remix) - 650,000 (11/12: 600,000)
Oops!..I Did It Again - 600,000 (07/13: 530,000)
I'm A Slave 4 U - 600,000 (07/13: 550,000)
Everytime - 600,000 (07/13: 570,000)
Radar - 600,000 (10/13) (07/13: 575,000)
My Prerogative - 450,000 (07/13: 430,000)
Me Against The Music - 400,000 (07/13: 370,000)
Do Somethin - 400,000 (10/10: 365,000)
Criminal - 400,000 (10/13: 350,000)
Stronger - 300,000 (06/12: 270,000)
Perfume - 275,000 (Kworb's year old estimations are around 265,000)
Lucky - 275,000 (01/11: 230,000)
Ooh La La - 225,000 (08/13: 155,000)
Not A Girl, Not Yet A Woman - 150,000 (01/11: 130,000)
(You Drive Me) Crazy - 150,000 (01/11: 125,000)
Outrageous - 150,000 (01/11: 120,000)
Sometimes - 110,000 (01/11: 95,000)
Scream & Shout (Remix) - 100,000 (?/?)
Boys - 90,000 (02/10: 60,000)
Someday (I Will Understand) - 80,000 (05/11: 65,000)
Don't Let Me Be The Last to Know - 50,000 (07/13: 45,000)
Overprotected - 50,000 (02/11: 40,000)
Born to Make You Happy - 50,000 (01/11: 35,000)
From the Bottom of My Broken Heart - 40,000 (06/12: 35,000)
I Love Rock N' Roll - 20,000 (02/11: 15,000)
Non-singles: 3,000,000
= 38,100,000
You should go for it, I'm doing a Miley one soon. 
Straight guys love that song