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.