Beautiful actress Jessica Simpson had a special trainer for her new film "Dukes of Hazzard", to make her bum look bigger.

Jessica wanted to have a sexy and bigger bum for her role in the movie, so she hired a special trainer, Mike Alexander, an old high school friend, to help her with the exercises and diets.

Mike revealed: "Jessica wanted more of a bump for her rear end instead of a flat butt.".

Jessica Simpson, who has recently turned 25, plays Daisy Duke in Jay Chandrasekhar's movie "The Dukes of Hazzard", based on the hit television series that ran from 1979-85. The Warner Bros. comedy will hit theatres on August 5.

The story written by Jonathan Davis, with revisions by John O'Brien and Broken Lizard, is set in present days, and follows the adventures of "good old boy" cousins, Bo (Seann William Scott) and Luke (Johnny Knoxville) Duke.

With the help of their eye-catching cousin Daisy (Jessica Simpson) and moonshine running Uncle Jesse (Willie Nelson), they try and save the family farm from being destroyed by Hazzard County's corrupt commissioner Boss Hogg (Burt Reynolds).