Aside from madonna, Britney is one of the very few pop acts that has sustained a successful solo career for nearly 15 years. Beyonce is the closest comparison but even she had 3 studio albums with Destiny's child before her solo debut which gave her a built in fanbase and in between her solo albums she released albums with Destinys child, which kept her visible to the general public..
Rihanna almost has as many albums as Britney but shes collaborated with countless artists and has been featured in so many songs its hard to name them all, also keeping her constantly visible.
However, like Madonna, Britney has basically been able to sustain her career based on her music alone for a decade and a half and shes still fairly successful. So is it really fair to expect her to compete with the newer girls when shes already had 15 years of success?
![Celestial 5](http://img.photobucket.com/albums/v232/korn0818/9b5f67d8.gif)