Kourtney Kardashian takes viewers behind the scenes of nude shoot (Photos)

Kourtney Kardashian took the KUWTK camera crew behind the scenes of her x-rated photoshoot..In the clip,the mother of three arrived to the shoot with only one concern in mind, her backside. 

Having recently lost weight, Kourtney stressed to photographer Brian that she felt like her bum 'disappeared.' 

'We need to plump it up!' she said between laughs.  'We want to make your sisters jealous,' he noted, encouragingly. 

Kourtney - who split from Scott Disick this summer and had a rumoured fling with Justin Bieber - then explained her reasoning behind her decision to do the risqué photo session.

'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?' she reasoned. 

Younger sister Kylie joined her during hair and make-up, noting happily that she was 'so skinny.'

See pictures after below;