1. Katy Perry vs. Ke$ha (Ke$ha wins 12-9)
2. Ciara vs. Keri Hilson (Ciara wins 17-4)
3. Christina Aguilera vs. Fergie (Christina wins 17-4)
4. Backstreet Boys vs. NSYNC (NSYNC wins 11-10)
5. Eminem vs. Jay-Z (Eminem wins 14-7)
6. Janet Jackson vs. Michael Jackson

Ke$ha

Very hard...
Based on singles, probably Katy.
Based on albums.. it's basically a tie. I rated both of their albums about the same.. IDK!!!

I guess Katy.

Katy by far.

Verry hard..but I'll go with

KATY PERRY! The girl is cranking out hits, and she has provened to me that she's here to stay!!!! Firework is an anthem!!!

Katy

ughhh... ill go with kesha here.

SO HARD
ughhhhh
I'll go with Katy

Ke$ha

Ke$ha

Katy all the way

Ke$ha, quite easily.

Ms. Katy Perry

I love katy but The Harold song so yeah Ke$ha

Both.

Katy Perry.

FYI, "both" and "neither" votes aren't counted