It's naive to think that the world's biggest stars are as chaste as Buddhist monks. They have thousands of easily accessible fans including some fellow very attractive starlets throwing themselves at them, sometimes with actual medieval catapults.
This means, of course, that their heads usually aren't in the right place. But even this sexually repressed Internet writer would have enough sense to keep his propolyaptics in a place where the paparazzi couldn't seem them. That's because if I were famous enough to have a limo, it would come with a pneumatic condom dispenser.