Jessica Simpson has revealed dairy products give her terrible wind.

The "Dukes of Hazzard" star - who is getting in shape for her new movie in which her character joins the Marines - has to watch her diet because her lactose intolerance causes her to omit gas from "all ends."

Jessica told TV show "Extra," "I am going to be all ripped. But it's tough, I'm not good on sugar. Or dairy - you'll hear it come out of all ends!"

The 26-year-old star - who recently went from a blonde to a brunette - does not mind changing her appearance and figure for film roles.

She said: "I've really become comfortable in who I am and in my skin. I feel beautiful whether I am five pounds heavier or five pounds smaller. I'm actually a natural brunette. I was really blonde as a kid, but then I just started getting darker and darker."

Jessica - who is dating singer John Mayer - also revealed she hopes to become a household name after adding a range of homewear to her label.

She said: "I aspire to be a brand like Ralph Lauren."

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