Kim Kardashian West's make-up artist had to spray her bottom with baby oil for her naked photo shoot.

Mario Dedivanovic has admitted that he was the person behind Kim's shiny bottom during her naked photo shoot for Paper magazine.

The 32-year-old make-up artist revealed that the secret to the reality star's slick appearance was down to a generic baby product.

He shared: ''I don't have a name for the oil. It's just a baby oil product from Europe. I just sprayed it all over her body from a pump bottle.

''Everyone keeps asking me about it. It's so crazy. It's just a basic baby oil product.''

Mario also revealed that the 34-year-old brunette beauty kept her face looking ''dewy'' after he sprayed ''some Evian [water] on her face''.

The photos - which were shot by the renowned photographer Jean-Paul Goude - included a full-frontal naked shot of Kim, but Mario has insisted that there were only three people on set during those snaps.

He told New York Daily News: ''When they did the nude shots, it was a closed set - just myself, Kim and the photographer. He sketched out what he wanted to do and we did it.

''The shoot was very fun. It's always a great experience when working with such an iconic legendary photographer.''

Despite having plenty of experience, Mario - who has worked with Jennifer Lopez, Christina Aguilera and Michelle Williams - explained that his role was relatively simple.

He added: ''The make-up [was] very quick. It took about 20 minutes. The hair was more detailed, more artistic. The make-up was very simple.''