David Becker, Getty / Jason Kempin, Getty
Our fourth round grudge match features two "American Idol" judges" -- Jennifer Lopez vs. Nicki Minaj. J.Lo is known for her club-worthy dance tracks, including her recent Pitbull collaboration, "On the Floor." Style chameleon Nicki Minaj is recognized as much for her eccentric fashion as for her hip-hop hits.
Who do you think should win round four of our "Most Influential Woman in Pop" March Madness bracket? Vote below ... and check back on Monday (March 11) to see the next two divas battling it out in round five.
| Jennifer Lopez | |
|---|---|
| Nicki Minaj |

- Jennifer Lopez: Bald Backup Dancers
- Justin Bieber: Lovely Latina Ladies
- Madonna: Much Younger Foreign Guys
- Jessica Simpson: The Super Buff, Athletic Type
- Justin Timberlake: Buff, Blonde Babes
- Rihanna: Guys With Lighter Complexions and High Cheekbones
- Taylor Swift: Cradle Robbers
- Jennifer Lopez: V Magazine Cover Story Shoot
- Jennifer Lopez
- Jennifer Lopez
- Jennifer Lopez
- Jennifer Lopez
- Jennifer Lopez
- Jennifer Lopez
- Jennifer Lopez
- Musicians Who Look Like Cartoon Characters
- Taylor Momsen and Kung Fu Panda
- Taylor Swift and a Japanese Anime Character
- Miley Cyrus and a Chipette from Alvin and the Chipmunks
- Nicki Minaj and Rainbow Brite
- Fergie and Janice from the Muppets
- Rihanna and Cleo, the fish from Pinocchio
- Nicole Scherzinger and Jasmine from Aladdin
- Relationship Reinventions
- Ashlee Simpson
- Ashlee Simpson
- LeAnn Rimes
- LeAnn Rimes
- Katy Perry
- Katy Perry
- Selena Gomez
- Selena Gomez
- Hilary Duff
- Hilary Duff
- Whitney Houston
- Whitney Houston
- Christina Aguilera
- Christina Aguilera
- Kelly Osbourne
- Kelly Osbourne
- Kelly Rowland
- Kelly Rowland
- Accident-Prone Pop Stars
- Kelly Osbourne
- Justin Bieber
- Jessie J
- P!nk
- SkyBlu of LMFAO
- Rihanna
- Sean "Diddy" Combs
- Musicians With Secret Embarrassing Pasts
- George Michael during his Wham! superstardom
- Drake as Jimmy on 'Degrassi: The Next Generation'
- Selena Gomez on 'Barney and Friends'
- Alanis Morissette's Pre-'Jagged Little Pill" Album
- Fergie's Time as a Wild Orchid
- Dr. Dre's World Class Wrecking Crew Days
- Katy Perry Christian Singing Past
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