But Matthew's having a bit of trouble keeping track of Potter-mania.
His schedule is pretty hectic! He's still filming Potter three, has just signed up to star in Potter four, and is still reading Potter book 5!
"Filming is going quite well," he said, talking about the long-awaited third movie, the Prisoner of Azkaban. "Neville's a great character to play.
"We're a bit behind schedule but we should be finishing soon. In fact, me, James and Oliver, who play Fred and George, should be finishing some time in October.
"It's quite hard to say goodbye to everyone but we will be starting to film the fourth one soon. I've officially signed up for the Goblet of Fire."