Louis adds to lyrics of Little Things
But don’t expect a Haylor reconciliation just yet – it’s thought that it was actually cheeky Louis Tomlinson, 21, singing the extra lyric.
It’s not the first time the lads have played a joke on Harry, 19, during their Take Me Home world tour.
Liam Payne, 19, pulled down the curly-haired heartthrob’s jeans at their O2 Arena gig in London on Saturday night, exposing his pants.
SEE PICTURES One Direction star Harry Styles and Taylor Swift hold hands on date in New York
VIDEO: One Direction‘s Harry Styles supports Cancer Research UK
VIDEO: One Direction coming soon
VIDEO: Teen Now meets One Direction part 1
VIDEO: Teen Now meets One Direction part 2
VIDEO: One Direction at Capital FM Jingle Bell Ball part 2