Jessica Simpson's character in her new comedy "Employee of the Month" has a secret, physical "flaw," discovered by coworkers at a New Mexico Costco-like store.

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The flaw will be revealed Friday on "Entertainment Tonight." Dane Cook and Dax Shepard play store employees who check out the sensational new cashier, but who has one very glaring, secret flaw.

When the two men learn the store's new employee has a weakness for ambitious guys, they go all out to compete for her attention, "Entertainment Tonight" reported.

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Simpson said her costars Cook and Shepard are "both really great guys, really fun."

Simpson said she will be keeping her clothes on for this comedy, unlike "Dukes of Hazzard," and she won't be singing either.