Jessica Simpson's Butt Workout 8/3/05

Jessica Simpson indulged in an intense diet and exercise regime to get her bottom in shape to play Daisy Duke in the Dukes of Hazzard.

The singer/actress was determined not to rely on a butt double to play the curvaceous cowgirl in her movie debut - so she enlisted the help of trainer Mike Alexander who put Simpson through a tireless schedule.

Alexander says, "Jessica wanted more of a bump for her rear end."

The 25-year-old was forced through lunges and squats while holding weights.

Alexander also put her on the South Beach Diet, which is low-fat and low in carbohydrates. In the end Simpson lost an impressive 3.6 kilograms (eight pounds) and dropped to an American dress size two.

She says, She says, "Daisy Duke was known for her ass, so I had to do her justice."