35. Cher vs. Madonna
34. Avril Lavigne vs. Hilary Duff
33. Christina Aguilera vs. Britney Spears
32. Madonna vs. Whitney Houston
31. Pink vs. Christina Aguilera
30. Christina Aguilera's Gum vs. Her Fans
29. Britney Spears vs. Avril Lavigne
28. Britney Spears vs. Christina Aguilera
27. Christina Aguilera vs. Britney Spears
26. Christina Aguilera vs. an Interviewer With a Cold
25. Whitney Houston vs. Mariah Carey vs. Madonna
24. Farrah Franklin vs. Beyoncé
23. Demi Lovato vs. Selena Gomez
22. Avril Lavigne vs. Britney Spears
21. Kylie Minogue vs. Mariah Carey
20. Aretha Franklin vs. Nicki Minaj
19. Nicki Minaj vs. Iggy Azalea
18. Mariah Carey vs. Nicki Minaj
17. Lady Gaga vs. Katy Perry
16. Mariah Carey vs. Nicki Minaj
15. Miley Cyrus vs. Katy Perry
13. Mariah Carey vs. Christina Aguilera
11. Katy Perry vs. Taylor Swift
10. Janet Jackson vs. Madonna
9. Rihanna vs. Ciara
8. Farrah Franklin vs. Beyoncé
7. Mariah Carey vs. Madonna
6. Mariah Carey vs. Christina Aguilera
5. Cher vs. Madonna
4. Madonna vs. Lady Gaga
2. Mariah Carey vs. Madonna
1. Mariah Carey vs. Jennifer Lopez
What happened: The interviewer asks Mariah what she thinks of Jennifer Lopez. She doesn't know her.
How shady was this actually? The shadiest of all. Mariah Carey definitely knows who Jennifer Lopez and uses the shadiest term of anti-endearment to describe her: "I don't know her." It doesn't get worse than that.