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)

Kylie & Kendall Jenner “Simply Bikini” at The Mirage hotel in Las Vegas

They might only be 14 and 16 years old but Kendall and Kylie Jenner are already causing waves in the modelling world.

The sisters displayed their modelling potential last week as they sported different looks from the Kardashian Khaos bikini line at The Mirage hotel in Las Vegas.

While Kendall, 16, kept things simple in a black two-piece, 14-year-old Kylie opted for a more eye-catching look in a black and white polkadot bikini with a hot pink trim.

Modelling stars: Kendall Jenner, 16, wore a simple black Kardashian Khaos bikini while her 14-year-old sister Kylie opted for a black and white polkadot two-piece

Stars of the future: Both Kendall and Kylie, who modelled the swimwear at The Mirage Hotel in Las Vegas last week, are keen to make it in the modelling industry (Read more and See more Pictures)

51 Pics of Kylie Jenner "Naturally" Bikini Butt & Ass Pics Gallery

Kylie Jenner is part of the Kardashian clan and appears on tehir reality TV shows Keeping up with Kardsahians and the new Miami spin off. Kylie Jenner is a student who enjoys shopping and spending time with her sisters Kim, Kourtney, and Khloe.

Joining the many around the world in celebrating the Easter holiday, the stars of Hollywood spent Sunday  doing everything from attending morning church services to enjoying a little family fun in the sun.

Kylie and Kendall Jenner soak "Bikini Sunbathe" up the sunrays in Hawaii

They have been busy little bees as they help keep the Kardashian empire humming.

And Kylie and Kendall Jenner enjoyed a much needed break in Hawaii today.

The two teenagers are holidaying on the tropical island with their parents Kris and Bruce Jenner.

Fun in the sun: sisters Kylie and Kendall Jenner soak up the sunrays in bikinis as they holiday in Hawaii