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AUG 29, 8PM
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Jennifer Lopez, Kim Kardashian

Juan Sharma/ Bruja/PacificCoastNews.com; JD/FameFlynet Pictures

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It's the battle of the booties as Kim Kardashian and Jennifer Lopez are both spotted sporting some serious junk in the trunk!

The 42-year-old American Idol judge was our Booty Queen gold medalist yesterday when she stepped out in a gold midriff baring Temperley top, pleated metallic harem pants and strappy gold heels that pumped up the jam and showcased those famous buns.

But the 31-year-old reality star-mogul-model was not to be out shined and worked her assets en route to the 30 Rock live show in NYC.

She wore a curve hugging black skirt, flowy cropped ivory silk shirt and black strappy Givenchy heels with padlocks around the toe and ankle—sending the message that she has sexy very much locked up!

So, which curvaceous beauty will win your vote for today's Booty Queen award?