Kim Kardashian and sister Khloe are showing off their svelte new figures in an ultra-sexy advertisement for Quick Trim.

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Kim, 29, and Khloe, 25, both appear in the ad wearing buttoned-up white collared shirts... and end up poolside in bikinis. The sisters recorded sexy voiceovers the weight-loss product ad.

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In November, Kim posted a photo on her Twitter account showing off her stellar new body. At the time, she tweeted, "Quick Trim photo shoot today in Miami! I finally feel I've reached my goal!"

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