Kylie & Kendall Jenner "Bikini Body" in The Mirage hotel, Las Vegas

Kylie said: 'I think we will definitely get it done with how fast [the process] is going.'

And Kendall added to E! News: 'We want to do something so different, something that we really love.'

The pair first brainstormed with their manager Kris Jenner on the book and are now working with Maya on the first in a possible series for publisher Karen Hunter at Simon & Schuster. 

They've got the poses! Both girls appeared to have taken posing tips from their big half-sisters, Kourtney, Kim and Khloe Kardashian (Read more and See more Pictures)