Jessica Dulls Down DD Display

TMZ caught Jess at dinner with BFF CaCee Cobb and Cobb's boyfriend Donald Faison at Cabo Cantina, just one night after Jessica Simpson strutted all over Hollywood, with her twins on full display. The formerly popping-out pop star pulled a 180 -- by wearing an ill-fitting white t-shirt and high-waisted pants that made her look like a server at an airport sports bar. Oh, but why, Jessica, why?!

Jess did learn something from her top-popping Monday night -- instead of walking all over town, Simpson smartened up and got herself a chauffeur.