Few things needed to improve the article... 

The most important thing is citations. I added tag to pin-point where it needs citations. Citations must come from reliable sources. This means no forums, blogs, livejournals, or any sites requiring registration. Sources are also needed regarding number of records sold. 

This article is also becoming too long. I removed tried to remove excessive information, especially trivias. They're interesting, yes, but they are unencyclopedic and information regarding her height and blood type is way to unencyclopedic.