PHOTOS: Jessica Simpson Guest Judges On Project Runway Finale

Who can remember that Jessica Simpson used to sing? In recent years, the buxom blonde has been riding high thanks to her booming fashion brand and on Thursday, she took that industry expertise to the front row of the Project Runway fashion show.

Simpson, sitting next to the show’s judges Nina Garcia, Michael Kors, and Heidi Klum, served as a guest judge on the reality competition’s finale episode during Mercedes-Benz Fashion Week in New York.

Simpson, in a glittering black mini dress and sky-high heels, was spotted giggling with Garcia before the show began.

On Tuesday, Simpson was up front and center at her own show. She premiered her first collection of denim in a casual presentation at her midtown showroom as run-up to Fashion Week. Her sister Ashlee, along with some choice friends, helped model some of the new duds and Ashlee’s rocker husband Pete Wentz served as DJ.

Also on hand: Simpson’s mom Tina and Simpson’s boyfriend Eric Johnson.