A photo of Kendall Jenner laughing while exposing her nipple is "her favourite".

The 20-year-old model is photographed in black and white, pulling down the right side of her black tank top.

Jenner posted the pic to Instagram as a celebration of her 40 million followers.

The snap, taken by sister Kylie is about as carefree as you will see the model, normally the most conservative of the Kardashian clan.

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my favorite photo for all 40 mill of you. genuine happiness...taken by lil Ky @490tx

A photo posted by Kendall Jenner (@kendalljenner) on

Sister Kim Kardashian previously broke the internet with a racy nude magazine cover for Paper magazine, appearing oiled up, balancing a martini glass on her backside.

More recently she posted a photo of herself completely naked and heavily pregnant on Instagram, in a bid to slam haters who criticised her pregnancy body.

- nzherald.co.nz