Jessica Simpson SQUATS on set and jokes with her fans 'when you gotta go, you gotta go!'

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Jessica Simpson was captured in a new behind-the-scenes Instagram snap sharing a big laugh as she squatted on set of her latest project and jokingly penned to her followers on Friday, 'when you gotta go, you gotta go!'The fashion designer, 42, could be seen in the photo bending over inside a large, blue tent that was placed outdoors on a patch of green grass.The mother of three, who recently published a short biographical essay titled Movie Star: They Always Say They're Single, appeared to be working on a photo shoot for her brand, Jessica Simpson Style.The Dukes Of Hazzard actress wore a pair of light, bluish-gray shorts along with a short-sleeved, white shirt with cutouts around the shoulders.She slipped into a pair of tan-colored, heeled ankle boots to complete her ensemble for the busy day.