Kardashian Sisters At War Over Who's Ass Is Bigger

Kim Kardashian's big sister, Kloe is working her "ass" out to take the title of the most colossal culo in Calabasas from sister, Kim ... as she was spotted leaving a private gym Tuesday afternoon.

The spandex-clad profile is oddly similar to the one Kim showed off just a few months back.
Readers tell us who you think will wear the crown.