Hundreds of Harry Potter fans turned up to a fan convention to meet some of the stars of the film.
Weasley twins James and Oliver Phelps and Robert Pattinson were amongst the celebs signing autographs at Collectormania in Milton Keynes.
Newsround caught up with the twins to find out how filming is going on the next Potter film, Order of the Phoenix.
James said: "We can't say too much, but filming is going really well - it's really good fun."
Oliver added: "We've met a few of the new actors to join the cast and they seem really cool and we're looking forward to working with them."
Meeting fans is fun
Although the boys were signing autographs and meeting fans for around seven hours a day, they don't find it boring.
James said: "It's still weird when there's loads of people coming to meet you, but at the same time quite nice as well."
Oliver agreed: "And it's all part of the filming process - it's nice to get feedback from everyone who's seen and appreciates the film."
The twins had a message for their fans too: "We hope you enjoy the new film as much as we enjoy making it."