Jessica Biel has?signed?a contract?to reveal her specific body parts in her new movie, Powder Blue, in which she plays a tripper trying to earn money to care for her terminally ill son.

A source told Us Weekly magazine: "Jessica signed a contract that explicitly details the bare minimum fans will see - including shots of her breasts and butt."

Jessica - who stars alongside Oscar winner Forest Whitaker in the movie - recently confessed she is worried about her dad and brother seeing her naked on screen.