Well Britney deserves it ! Too bad 17 million of Baby One More Time can't not be counted, otherwise she would outsell all other female artists in this list combined altogether.
And i can`t understand why people still say P!nk is not that famous in US.
She is a worldwide star, and is huge is US too..
well Try This and beginning stages of IND have pushed her down, but after the success of U+Ur Hand and now with Funhouse she's going back to her previous glory.
The upcoming US tour will get her back into the superstardom in the US as well.