Stephanie went along the premiere of Thunderpants and even got to meet Rupert Grint!
"When we went into the cinema we saw Rupert having pictures with fans.
I asked for a picture with him and my mum took loads of pictures of us to together.
Just before Thunderpants started All Stars sang a song which featured at the end of the film.
Then we broke a world record! - the most people sitting on a whoopee cushion all at the same time!
Thunderpants was hilarious!
The whole story is about these two best friends, Patrick Smash (Bruce Cook) and Alan A. Allen (Rupert Grint).
They make an invention called Thunderpants which is so successful they make more inventions using Patrick's farting power.
I give the film 8/10. It's more a boy's film than a girl's.
After, I got a goody bag containing Thunderpants items, from a T-shirt to a poster.
I also got some other famous people's autographs and photos.
Stephanie, 12, London
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