Kim Kardashian Gets Measured, Butt Why?

Kim Kardashian's having her butt measured! Can you guess why?

OK! GALLERY: OK! BEAUTY WITH KIM KARDASHIAN

Kim shared a photo on her blog of her behind being scoped out with some kind of measuring device, but she won't reveal why without having some fans take a guess first.

"Hmm… why would I be getting measured… Curiosity?" she wrote. "Dress fitting? Can you guess?"

OK! GALLERY: LIFE'S A RUNWAY FOR THE KARDASHIANS