Megan Fox begged her assistants to do up her corsets as tightly as possible in new film 'Jonah Hex'.

The 24-year-old actress - who plays a prostitute in the Wild West flick - admits she pleaded with stylists on set to breach health and safety regulations by lacing up her corset extra tight.

She said: "They really didn't want to lace me up too tight even though I was loving it and I wanted them to.

"They kept saying how I could pass out and that they were not allowed to, but I did get them to lace me in so my waist was like 18ins."

However, the brunette beauty - who was recently left the 'Transformers' film franchise in favour of British model Rosie Huntington-Whiteley - admits she had to let them loosen the restrictive garments when taking part in many of the film's action scenes.

She added to Absolute Now: "For the action scenes though, I had to have it loose because they were convinced I was going to faint."