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The pop star showed up unannounced to introduce Katy Perry: Part Of Me to a theater full of excited youngsters in the British capital. She told the crowd, "Hey, hello! Is it alright that I'm here? We're going to watch my movie!" before popping on a pair of 3D glasses and taking a seat in the middle of the cinema.
Perry also posed for pictures with fans and handed out popcorn to the audience.
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The singer posted a picture of herself sat in the cinema on her Twitter page and wrote:
The documentary, which opens in July, features concert highlights and behind-the-scenes footage, as well as clips from her personal life and childhood.
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