Bieber's pants fall down on stage

Justin Bieber almost lost his trousers on stage, as they began to fall down in the middle of a concert.

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Justin Bieber wardrobe malfunction as bum falls out on stage at

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Justin Bieber wardrobe malfunction as bum falls out on stage at

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Bieber's pants fall down on stage

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Topless Justin Bieber's trousers fall down on tour in Singapore