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The second Harry Potter film, The Chamber of Secrets, is going to be "really, really, really good" according to Chris Rankin - the actor who plays Percy Weasley.
He told Newsround what some of the new film's sets are like.
He said: "I've seen the Chamber of Secrets - and without spoiling any of the magic, it's wonderful and it's going to be a really, really, really good film."
Chris is currently performing in a musical called Honk in Norfolk.
It's a modern take on the story of the Ugly Duckling and he says it has great music and is very funny.
And the other cast members enjoy acting alongside a movie star.
One of them told us: "He's on in the cinema and you go 'Oh wow, I know him!', and then you're standing next to him and you're like - 'Oh wow!"
But Chris will have to miss some of the performances to film the final scene of the second Potter movie - the feast.
And he revealed some details about the scenes he's already shot.
He said: "I've done a couple of corridor scenes with Tom Felton who plays Draco Malfoy. There was a good shouting match in that one - it was a lot of fun."
Article taken from CBBC Newsround.
