Justin Tiberlake's Ass.

A nude image of Justin Timberlake from rom-com Friends With Benefits was leaked to the interwebs yesterday!

The photo shows JT on top of Mila Kunis during a sex scene–and the angle gives a generous glimpse of the singer/actor’s butt.

Fans spotted the image on the NSFW-friendly photo host site Postimage.org.

Here’s the premise of the movie: “The relationship between two friends gets complicated when they decide to get romantic.”

Friends With Benefits is in theaters now.