The top 10 are:
1. Madonna – $72 million
2. Barbra Streisand – $60 million
3. Celine Dion – $45 million
4. Shakira – $38 million
5. Beyoncé – $27 million
6. Gwen Stefani – $26 million
7. Christina Aguilera – $20 million
8. Faith Hill – $19 million
9. Dixie Chicks – $18 million
10. Mariah Carey – $13 million
Hilary Duff sits at 11, surprisingly beating out Britney Spears and Fergie. That seems unbelievable, probably even to Hill herself.
11. Hilary Duff – $12 million
12. Avril Lavigne – $12 million
13. Martina McBride – $12 million
14. Britney Spears – $8 million
15. Carrie Underwood – $7 million
16. Nelly Furtado – $7 million
17. Fergie – $6 million
18. Jennifer Lopez – $6 million
19. Sheryl Crow – $6 million
20. Norah Jones – $5.5 million
[source: Forbes.com ]