Watch the hilarious moment Justin Timberlake and Anna Kendrick get the giggles as they fail to light up the London Eye

JUSTIN Timberlake and Anna Kendrick collapsed into a fit of giggles tonight as they failed to turn the London Eye on.

The Hollywood duo were given the honour as they promoted their new film Trolls.

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Anna collapsed in laughter when Justin pressed the button to light up wheel in bright colours, only for it to fail to work immediately.

Luckily, the stunt eventually succeeded, after Justin had comically pressed the big red button several times.

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The pair joined life sized characters from the new animation on the red carpet, with Justin even showing off his impressive dance moves.

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Anna, who provides the voice of Poppy, wore a chic black and green strapless midi-dress with pale grey heels.

Justin coordinated with his co-star in a green blazer over a blue shirt and grey trousers.

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The Can’t Stop the Feeling singer lends his voice to Branch the troll in the film, he said he was looking forward to working with his co-star.

Speaking to E! earlier this year, he said: “Anna came onto the movie first.

“I had a little bit of an advantage of being excited to work with her on this and then getting to work on all the music too was very exciting for me.”

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