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Niall Horan and Liam Payne play impromptu gig at shopping mall

One Direction stars Niall Horan and Liam Payne stunned shoppers at a London mall by playing an impromptu gig on Thursday (02Aug12).

The pair turned up at the Westfield retail centre in London's Shepherd's Bush and surprised passers-by as they set up a stage near an escalator in the middle of the mall.

Shoppers quickly realised the buskers were in fact the superstar boyband members, and gathered around to watch them perform an acoustic version of the group's biggest hits, including What Makes You Beautiful.

Horan strummed on a guitar while Payne serenaded the cheering crowds. The pair was followed by a camera crew, sparking speculation the stunt was planned for an upcoming TV show.