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A jubilant, post-workout Jessica Simpson was spotted leaving the gym in Beverly Hills yesterday, and it looks like the newly single starlet is going to keep this up, as she seems to be on a bit of a revenge diet! Jess has already shed ten pounds, and a source tells OK! mag, "Right after Tony ended things, Jessica said, 'I want my old body back.' She went into her kitchen, got a trash bag and started to clear it out."

Think she'll be able to squeeze into those Dukes of Hazard duds anytime soon? You know she's got those infamous daisy dukes stashed away in the back of her closet somewhere!