When your name is J-Lo or Jay-Z, people pay attention. But star power isn't enough to ensure a thriving business, as plenty of wannabe celebrity entrepreneurs--from the worlds of food to fashion--have learned the hard way.
When it comes to making payroll and appeasing investors, famous people flop like the rest of us. "Celebrities are coming in with a leg up, but it doesn't make the back end any easier," says Allen Adamson, managing director of Landor, a Manhattan-based brand-consulting firm.