Britney Spears's (Oops… I did it again) 10-best-selling downloads

And, here are Spears's (Oops… I did it again) 10-best-selling downloads (and remembering that her career predates the dawn of the digital era by a few years):
 "Womanizer," 3.5 million;
"Circus," 3.1 million;
"Till the World Ends," 2.9 million;
"3," 2.3 million;
"Toxic," 2.2 million.
"Piece of Me," 1.9 million;
"Gimme More," 1.81 million;
"I Wanna Go," 1.77 million;
"Hold It Against Me," 1.6 million;
"If U Seek Amy," 1.3 million.

Albums:
…Baby One More Time (1999), 10.6 million;
Oops!...I Did It Again (2000), 9.2 million;
Britney (2001), 4.4 million;
In the Zone (2003), 3 million;
Circus (2008), 1.7 million;
Greatest Hits: My Prerogative (2004), 1.5 million;
Blackout (2007), 1 million;
Femme Fatale (2011), 788,000;
Britney Jean (2013), 265,000;
The Singles Collection (2009), 250,000.