Who needs enemies when you have cheeky friends like the One Direction boys to cause you embarrassment?
The 1D lads were back to old tricks when they decided to post a photo of band member Niall Horan suffering a self-inflicted nip-slip to Twitter.
In the snap - surely bound to cause the blonde popstar countless sleepless nights spent cringing - Niall can be seen exposing his left nipple during a rehearsal session with his bandmates.
The snap posted by Harry Styles on his Twitter page, shows Niall dressed in tracksuit bottoms and a vest pulled to one side, baring his nipple while he tugs on the strings of a guitar.
The curly-haired singer jokingly captions the semi-nude snap with:"@NiallOfficial Nip Slip."
Niall's love of exposing his body has been well-documented in the past, with the 1D singer admitting in a previous interview that he often sleeps in the nude.
Meanwhile, Niall took to his Twitter account to dismiss new rumours he had taken ill while rehearsing for his One Direction's upcoming world tour.
"I'm not in hospital ! Where do these rumours start! Please don't believe any of the rumours u here (sic)" he assured his followers.
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