At last night’s One Direction concert at London’s O2 Arena, Liam Payne decided to play a prank on his bandmate Harry Styles, giving fans an eyeful of their idol in his pants.

During a performance of the band’s smash hit ‘What Makes You Beautiful’, Harry took the lead vocals while Liam handed his microphone to bandmate Louis before tugging down Harry’s skinny jeans in front of the cheering crowds.

The sold-out crowd screamed as poor Harry desperately tried to pull up his trousers with one hand and gripping his microphone in the other.

Such pranks are not uncommon among the 1D lads. In fact, Zayn Malik tore off Harry’s shirt during a performance in Chicago just last year. 

Watch the moment Liam pulled down Harry's trousers and when Zayne ripped Harry's shirt here: