Adele has another 10 million or so to sell right, she'll get there on her next album or the one after.
Beyoncé needs another 3-4 million, so will she, by 2013.
(even though shes sold 30 million in the US alone already)
Alicia has passed 30 million hasn't she?
Gaga with on her fourth alberm as well.
Rihanna on her 7th or 8th, depending on when she releases.