Britney 4th most powerful female singer since 1999!!!

1. Madonna - $373 million

2. Beyoncé - $352 million

3. Celine Dion - $279.5 million

4. Britney Spears - $234.7 million

5. Lady Gaga - $204 million

6. Jennifer Lopez - $191.4 million

7. Taylor Swift - $165 million

8. Cher - $101.1 million

9. Miley Cyrus - $98 million

10. Katy Perry - $89 million

11. Shania Twain - $82 million

12. The Spice girls - $70 million

13. Mariah Carey - $58 million

14. Rihanna - $53 million (debut)

15. The Dixie Chicks - $47 million

16. Pink - $44 million

17. Hilary Duff - $38 million

18. Adele - $35 million (debut)

19. Jessica Simpson - $33 million

20. Tina Turner - $31 million

21. Bette Midler - $31 million

22. Gwen Stefani - $27 million

23. Carrie Underwood - $23 million

24. Alicia Keys - $15 million

25. Ashley Tisdale - $5.5 million

Source: Forbes