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?
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: