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Jessica Simpson is slimming down, and she's proud to show off her svelte body in a new Weight Watchers commercial.

The 31-year-old Fashion Star mentor, who gave birth to her daughter Maxwell on May 1, admitted to gaining over 60 pounds during the pregnancy.

Simpson posted the above photo while on set of the new commercial and Tweeted the following, "That's a wrap on the @weightwatchers commercial!"

With an all-black ensemble ... including sky-high heels, looks like Eric Johnson's fiancee is looking fabulous! Can't wait to see the finished commercial.