Clemence Poesy plays Fleur Delacour in Harry Potter and the Goblet of Fire.
Newsround chatted with her to find out how she got the part, what it was like making the film, and what it's like playing the beautiful character.
Can you tell me how you got the part for Harry Potter?
It was quite simple actually. I was talking to a casting director who I've known for quite a while. He was telling me that he was looking for girls for Harry Potter four, and told me to "come along, you might be too old for it, but come in anyway".
And I came in, had a little chat with him in English then I met Mike Newell a few weeks after that when he was in Paris. Then I came to London for a very quick audition, and that was it.
Then you got a phone call saying you got the part?
How did you feel about that?
Yeah. Happy (laughs).
Were you daunted by the prospect of coming into a high-profile film?
Well, you know that it's gonna be an experience that you certainly won't have a lot in your life being in such a big film and living such an adventure so, yeah, it was quite daunting.
I have no set plans at the moment. I would like to go to university - even if I hadn't got the part, but this is a once in a lifetime opportunity so I'm not going to miss that.
How much did you know about your character Fleur?
Well, I had read the book so I knew what was in the book, which is basically what's in the film.
Were you a Harry Potter fan then? Had you read all the books?
I read the first four books, and I loved them. Sure.
Have you read any of the ones since? Because Fleur continues to be in the books after four.
Yeah, I've been told. I haven't read them since. I tried to read the fifth one while on a break while shooting but I was working on it at the same time. I'll just give myself a bit of time and read five and six.
Will you come back? Has anyone made any decisions about coming back for future films?
I don't know.
Would you like to?
Yeah! Why not?
Fleur's a bit of a man-magnet - how did you feel about playing that kind of role?
I don't know. I've never been that kind of girl, certainly! But once you're in your costume and everyone has been told to look at you when you pass by, it makes things very easy.
I assume there's a lot of scenes where all the men are gawking as you walk past - was that quite funny to film?
It was, yeah, yeah! It's always fun.
How did you get on with the others? You had scenes with Daniel Radcliffe particularly. How did you get on with him?
Very well. He's a great guy. Interested in lots of things. Other than cinema, you can talk about music, you can talk about what's going on in the world, you can talk about a million things. He's great - always in a good mood!
You must have spent a lot of time with the other characters - how did you get on with them?
Well, very well. It was just lots of fun really doing that movie because we were just running around the set and having fun together - so no, it was nice.
What was one of the best bits for you? There's lots of action sequences in this book. All the tasks are so action-packed.
I guess shooting the main sequence, the very last task, was the best bit for me. Because that's where, acting-wise, you got the most challenging thing to do. So that was great. We started, actually, filming with that, so it was a great experience.
And then we shot all the bits underwater - that was another type of experience. Maybe not as much to do with acting, but we had to learn how to scuba dive which I would never have done on my own.
We spent nearly a month acting underwater which is something you certainly don't learn at drama school!
You must have been very wrinkly at the end?
What about the special effects? Did you have to do a lot of scenes with things that weren't there?
Not that much. Underwater, quite a lot. But I couldn't see anything so even if they had been there, I wouldn't have been able to see them. And yeah, you've got the bits with dragons and stuff, but most of the time even on a normal movie you very often end up talking to a cross that's in the camera, so it wasn't that different.
Did you learn to dance?
Yeah, we did, we had some dance lessons and that was great fun because we shot that sequence actually two weeks before Christmas and the whole set was silver. We had dancing lessons all together which was something, because we're not dancers so it was quite funny! And then we spent the very last week before Christmas dancing all together so it was a bit of a party kind of spirit.
The trailer that you're in looks spectacular.
I know! Doesn't it? I never thought it'd look like that.
The film is coming out at the end of the year. Are you ready for Pottermania?
I don't know if you're ever ready for that kind of thing. We'll see. I don't know.
What was the best bit of filming?
Well you know, everything! But filming the maze was certainly a great moment I think, for the four of us. And then the Yule ball was very cute, and then the underwater, and then, just everything! It was really like being on holidays for eight months!
Is there a downside to filming? Was there something that got to you after a while?
Not really. I mean, once you found something to do with your waiting time, it's great. You can read. I met a vocal coach on Harry Potter. We worked together on my English accent, so no - it was just fantastic.
Did you find yourself star struck by some of the huge name actors?
Not really to be honest. They're all human beings and they've done wonderful films. I love their work but as human beings, I guess we're equal in a way.