Jolie participated in the shooting of Salt barely six months after giving birth to the twins Knox and Vivienne.

The 'Salt' movie trailer shows Jolie in a black bra and panties, flat tummy and all.

Jolie has also dyed her long hair nearly black for the movie, but also dons a blond wig occasionally. 'Salt' is due for release in July 2010.

The role of CIA agent Salt had been set for a male lead, specifically Tom Cruise, but the part was rewritten for Angelina Jolie, despite the fact that turning the character from a man to a woman wasn't necessarily easy.

“We had to rethink the whole notion of how a man vs. a woman operates in the business world, in personal relationship and in friendships," producers said in a interview.

A larger version of the photo above is here. Below is the video trailer of Salt: