5. Katy Perry
You would never guess that Katy Perry was into Christian rock and started out singing gospels. Although her initial album was an epic fail, she soon followed it up with “One of the Boys” in 2008, which contained her epic hit “I Kissed a Girl”. After that album, she released banger after banger, including “Teenage Dream” and “Dark Horse”. She’s not just one of the highest-earning female stars today — she’s held that title for over a decade.