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LAS VEGAS, NV - MAY 22: (EXCLUSIVE COVERAGE) Khloe Kardashian hosts at 1 OAK Nightclub Las Vegas at the Mirage Hotel & Casino on May 22, 2015 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)

LAS VEGAS, NV - MAY 22: (EXCLUSIVE COVERAGE)  Khloe Kardashian hosts at 1 OAK Nightclub Las Vegas at the Mirage Hotel & Casino on May 22, 2015 in Las Vegas, Nevada.  (Photo by Denise Truscello/WireImage)