Newsround sent Ricky on a magical mission to spend the afternoon with some of the most famous actors in the world.
But even people who are used to being on television themselves can sometimes get nervous around the biggest names.
So what happened when Ricky went to chat to the Daniel Radcliffe, Rupert Grint and Emma Watson?
"They call these type of interviews press junkets. You get around five minutes to sit down with an actor and talk about their film, while lots of people from behind the scenes watch you.
Ricky had to register
It can be pretty nerve-wracking, especially when it's your first ever press junket!
And what a way to start - by interviewing Daniel Radcliffe, Emma Watson and Rupert Grint!
I had to wait inside a hotel in London with lots of journalists from all over Europe.
It's not just in the UK that the films are a hit. So far they've made nearly £3 billion pounds at the box office, so lots of other channels and TV stations want a piece of the action.
Floor of hotel hired out
Ricky meets Harry Potter stars
Inside the hotel a whole floor had been hired out by Warner Bros. - the company that makes the Harry Potter movies.
Each hotel room was set up with a couple of cameras, lights and of course a hot seat for the star and a regular seat for the journalist - in this case me!
To make sure all of the interviews run on time, people wearing headphones and phone sets communicated with each other. They look very important and I didn't want to get in their way.
Ice cream van obsession
My first interview of the day was with the star of the film, Daniel Radcliffe. It was an honour to meet him, he was a really nice chap.
Later in the day I sat down to talk to Emma Watson, who told me about her career in fashion and then Rupert Grint who, believe it or not, is obsessed with ice cream vans!
The whole thing was a great experience for me and the cast made me feel at total ease - cheers guys!"