I emailed billboard asking about her all single sales and I got the reply...
http://www.billboard.com/#/column-ch...05357352.story
5,011,000, "Hot N Cold"
5,002,000, "California Gurls," featuring Snoop Dogg
4,902,000, "Firework"
4,682,000, "E.T.," featuring Kanye West
4,131,000, "I Kissed a Girl"
3,922,000, "Teenage Dream"
2,405,000, "Last Friday Night (T.G.I.F.)"
2,053,000, "Waking Up in Vegas"
953,000, "Thinking of You"
403,000, "Peacock" (dance club single; not promoted to pop radio)
("The One That Got Away" has sold 74,000 downloads. "Hummingbird Heartbeat"? 82,000)