Article continues below advertisementJessica Simpson had quite the moment during her big return to the stage!The pop icon performed on NBC's Today show on Wednesday, July 23, taking over Rockefeller Plaza as part of the network's summer concert series, but according to an insider, Simpson allegedly let it all out during the performance.Article continues below advertisement"She returned backstage after her performance and... spilled... to people in the greenroom," a source claimed to an outlet, revealing that the singer allegedly peed her pants during the set.