Credit: @JessicaSimpson/Twitter.

Halloween was a treat for Jessica Simpson. Today on Twitter, the 32-year-old new mom and Weight Watchers spokeswoman showed off her figure in a milk maid's outfit, complete with a lace miniskirt, thigh-high boots and a waist-cinching corset.

Her fiance Eric Johnson posed in a Braveheart costume holding their daughter, Maxwell Drew Johnson, who was dressed as a rooster.

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Simpson's been on the slim-down warpath since giving birth in May and signing a reported $3 million dollar contract to be the celebrity face of Weight Watchers. In September, she told Katie Couric she had lost more than 40 pounds.

"During pregnancy, I didn't really think about it," she said about her weight gain. "I thought my doctors were telling me that it was just a lot of water and whenever my water broke my whole entire stomach would go down but that did not happen. All the weight did not come out with the baby."

One of her biggest obstacles has been staying away from chocolate.

"I've never wanted chocolate more in my life," she told Couric. I've had to really stay focused and focus on my diet and concentrate on what I'm putting in my body."

Perhaps the Simpson-Johnson house will be giving out apples this year.

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