Reality TV star Kourtney Kardashian posed completely naked for a photoshoot in the latest episode of "Keeping Up With The Kardashians".

"I got asked to pose for this nude shoot which is going to be in a fine art gallery. I work out every single day so I feel like, why not?" the 36-year-old said, reports mirror.co.uk.

Photographer Brian Bowen Smith admitted he wanted Kourtney's famous sisters to be green with envy when they saw the results of the shoot.

“If you’re not blown away by your picture, then it means we didn’t do it right," he said.

“You’ll be pleasantly surprised how nice your a** is going to look. We want to make your sisters jealous."

Kylie Jenner, 18, was present for the photo session and was astounded by how great Kourtney was looking.

Claiming the eldest of the TV clan was her "favourite sister" because of her new-found strength, she told the camera: "She is focusing on herself and laughing again and just being the Kourtney I knew like five years ago."

The photographs - which are printed on metallic paper and presented with no glass to emphasise the "tantalising textures of skin" - went on display at the De Re Gallery here between October 22 and November 19.