Sienna Miller reveals sex scene secrets

Sienna Miller has revealed that her body was covered in make-up for the sex scenes in her new movie Factory Girl.

The 25-year-old actress admitted that clever lighting and make-up were used to ensure that her stretch marks are not visible on screen.

She told The Sun: "They put make-up all over your body so it looks like you have a nice bum and you don't see the stretch marks that us girls all have.

"They take hours lighting the scene so that you don't see every lump and bump and they spray your bum so it looks nice – but it doesn't really look like that in real life."

In Factory Girl Miller stars as Edie Sedgwick, the muse of Andy Warhol who died tragically of a drugs overdose at the age of 28. It opens on March 16.