Kim Kardashian vs. Kylie Jenner: Battle of the Bikinis!

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It's time for a sexy sisterly showdown.

While on vacation in Miami this week, Kim Kardashian took a selfie of herself in a bikini. But not just any bikini... one that belongs to 16-year old sister Kylie Jenner!

In other words: It's totally on now!

Already one of Hollywood's most overexposed celebrities, Kim exposes a whole lot of herself in the following photos. But does she outdo her half-sibling?

Compare, contrast and vote: Who wears this bikini best?

Fashion Face-Off!

Kim Kardashian and Kylie Jenner are actually wearing the SAME bikini in this photo. Who pulls it off best? View Poll »

Kim, of course, is often known to wear a bikini or two dozen.

Relive some of the best Kim Kardashian bikini body moments here:

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Kim Kardashian Biography

A Kim Kardashian Selfie
Kim Kardashian is the ex-girlfriend of Nick Cannon, Reggie Bush and Ray J. She had intercourse on camera with the former, which is what... More »
Los Angeles, California
Full Name
Kimberly Noel Kardashian

Kim Kardashian Quotes

So far, designing is the most exciting thing I’ve done... I have a vision of what I want [the clothes] to look like in my mind and it’s fun to see it come alive on paper.

Kim Kardashian

He just seemed very firm about the change, and that’s, like, his motto.

Kim Kardashian [on Barack Obama]