Justin Timberlake's mum caught him having sex

Justin Timberlake's mum once walked in on the star having sex.

The SexyBack hitmaker admits he was getting intimate with a girl in his bedroom when his mother opened the door.

He recalls, "My mom wasn't cool about it. I was too young to be in bed with a girl, so she was upset."

And Timberlake, 30, admits he still shrinks at the thought of his mother seeing him naked - like she will when she checks out his new film Friends With Benefits, in which he strips down with co-star Mila Kunis.

He adds, "I'm still trying to get into the editing room and cut down on my a** time. I'm like, 'Oh my God, my mum's gonna see that!'"