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8 April 2013, 12:23
The 'One Thing' star surprised his bandmate on stage in front of the audience at London's O2 Arena.
One Direction star Harry Styles was left red faced after bandmate Liam Payne pulled his trousers down on stage at London's O2 Arena last night (7th April).
The group were performing their hit single 'What Makes You Beautiful' at the time of the incident.
Liam snuck behind the floppy-haired singer as he performed a solo section of the track and shocked the thousands in attendance with the stunt.
The rest of the group were in hysterics at the time and the crowd were screaming as Harry flashed his legs and underwear.
Watch the moment Liam Payne pulls down Harry Styles' trousers during One Direction's gig at London's O2 Arena below:
Meanwhile, Liam has also been taking to Twitter to reveal how thrilled he was to be performing at the venue in the capital.
He wrote: "Playing at the o2 this week has been a dream of mine for agesss! Thank you to everyone who has come to see us love you alllll! :)"
The group were also filming during their shows for their forthcoming 3D concert movie – which is released this summer.