The Kardashian sisters have decided to go topless for their new Kardashian Kollection - a range of denims exclusively designed for Sears... the reason - they wanted to keep it "natural".

"Kourt, Khloe and I decided to go natural for our Kardashian Kollection denim shoot with Nick Saglimbeni and pose in only our favorite jeans! What do you think of the pic? I think it's such a beautiful shot and Khloe and Kourtney both look so stunning! Xo," Kardashian said on her Web site, when announcing the new collection.

The new range of denims has been designed, or so the sisters claim, to have specific cuts that are tailored to a woman's body shape.

"The Kim" is a sexy curvy low rise straight leg; "The Kourtney" is a slim fit low rise skinny leg and "The Khloe" is a tall curvy high rise boot-cut.

"We banned tops from our Kardashian Kollection denim shoot! Jeans only, baby!!" Kourtney was quoted as saying, in The Mail Online.

The three siblings, all stars of their own reality television show "Keeping up with the Kardashians" modeled for the denims themselves and the collection is due to launch in four weeks time, according to co-creator Bruno Schiavi, who was quoted on People magazine's Web site.