Watson's double.

One of the first things you notice wandering around the outskirts-of-London set of 'Potter'? There are twice the number of main characters. Each lead has a stand-in, and they look so strikingly similar (and are also sporting identical costumes), it's easy to confuse them at any distance. "It's weird," Grint admits. "And they all sit together at lunchtime!" Emma Watson even admits she wishes she could send her body double to education classes in her place. The only problem? "She's like 24, something like that," Watson says.