TWILIGHT star Taylor Lautner suffers from a condition that means he can never sit still - he's one of 12 million Americans battling restless leg syndrome.
The complaint, officially known as Wittmaack-Ekbom's syndrome, means Lautner, 17, suffers the irresistible urge to move his legs.
He explains to Star magazine, "I can never stop bouncing my knee. People always tell me to stop, but I can't force it to stay still. If we're in the car, I'll end up shaking the whole car."