Of the pop girls, that is. And if they're currently in the middle of an era, I had to use the album released before their current. Based of US iTunes as of today. I'm curious, also shocked at some of the highest selling tracks...BFB, Alone, Americano.

Anyway, which do you prefer?
Adele - Rumour Has It (which, believe it or not, was NEVER officially released to US radio

)
Beyonce - I Was Here
Britney Spears - Big Fat Bass (feat. will.i.am)
Christina Aguilera - Vanity
Jennifer Lopez - Hypnotico
Katy Perry - Peacock
Ke$ha - Sleazy
Kelly Clarkson - Alone
Lady GaGa - Americano
Madonna - Masterpiece
P!nk - Bad Influence
Rihanna - Cockiness (Love It)
Taylor Swift - Enchanted