Jessica Simpson shows off her pert derriere wearing The Warm Up athletic range

By A Mystery Man Writer

The brand is sold at Macy's. The 35-year-old recently celebrated the 10-year anniversary of her self-titled clothing line.

Jessica Simpson's work during her daily trips to the gym is starting to show. A toned Simpson was spotted leaving her personal trainer wearing a t-shirt that displayed her muscular arms. Hollywood

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