One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Liam Payne of One Direction makes a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Liam Payne of One Direction makes a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)

One Direction at Westfield's Shepherds Bush

LONDON, ENGLAND - AUGUST 02: Niall Horan and Liam Payne of One Direction make a surprise visit to Westfield London, Shepherd?s Bush on August 2, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images for Westfield)