And I wouldn't put GaGa on the same level as Ke$ha, and Katy. GaGa is a much bigger star, and she is a global superstar. GaGa has accomplished much more in a short career spanning 3 years, that Katy and Ke$ha can ever dream of. Lets seem them do a WW tour that is on point to gross over $200 million. Those ladies aren't even on Rihanna's level of success.

Ke$ha doesn't even have longevity, and Katy has a better shot than she does.