Jessica Simpson is having a tough time of late - both emotionally and physically, according to her dad. At the afterparty for sister Ashlee's Chicago debut in London, Simpson reportedly stormed out of the venue, shouting, "I don't want to be here - why won't people just leave me alone?" And at a shoot for a TV commercial recently, the singer was over an hour late due to a stomach bug. Hairdresser Ken Paves was overheard telling people, "Well, what do you want her to do? S**t her pants?" Her dad and manager Joe Simpson told a British paper, "Jess is quite down at the moment. She's not comfortable talking to people as she's quite depressed and we're walking on eggshells."source