You could make a case for each one of them to be in role models in their own way. In a traditional sense it's obviously Katy, but that doesn't mean the example she is setting is more powerful than the others.
History will show a dark time in our culture in which a million followers on Twitter became a key component to winning a Grammy. But thank God for Pink. While Christina Aguilera has a tendency to oversing, Britney Spears can't sing, and Lauryn Hill sorta stopped singing, Pink has managed to carve a brilliant 13-year-career by being something that is incredibly rare these days -- an artist. A complete artist. - CNN