One Direction fans out there will know very well that Harry Styles has more than his fair share of nipples, four to be exact. But have you ever wondered why?
The singer revealed that internet rumours about his 'supernumerary nipples' were, in fact, true, even pointing to where they were during an interview a few years ago.
And while most might think it's quite rare, specialists have revealed that polythelia is actually not that uncommon at all, and a lot of people don't even know they have it.
Dr Joshua Zeichner is on the NYC Board Dertified Dermatologist and explained why it occurs.
He said: "When the body develops, sometimes nipple forming cells accidentally migrate down the chest below the normal nipple.
"Supernumerary nipples can develop anywhere on the chest, armpit, even belly or into the groin, along a vertical line below the nipple, known as the 'embryonic milk line."
And while many of them only measure a centimetre in diameter, they can often have a little bump in the middle, like any bog standard nip, as well as breast tissue underneath.
Dr Zeichner said: "They most commonly appear as small, pink bumps, but in some cases a fully formed nipple with underlying breast tissue may develop.
"The nipple is harmless and is more of a cosmetic issue than anything else.
"In some cases, where there is a more developed nipple with breast tissue, the tissue itself may become sensitive in women during the menstrual cycle or even produce milk after pregnancy."
In the rare cases such as these, where the breast tissue is more developed for some women, the nipple should be monitored by a doctor the same way breasts are for signs of disease.
But Styles isn't the only famous face to open up about their nipples.
In 2017, Mark Wahlberg revealed he has three of them.
During an interview on Good Morning Britain to promote Daddy's Home with co-star Will Ferrell, Ben Shepherd asked Wahlberg to identify Ferrell's torso from four of his other co-stars, which he got right straight away.
The television host then asked Ferrell to pick which of the following three statements about Wahlberg's body were true - that he has 16-inch biceps, a third nipple and a six-pack.
"He's definitely got a six-pack," said Ferrell. "And I think the 16-inch biceps thing is true."
That's where he stopped. "However, I'm unaware of a third nipple," said Ferrell.
Now, Wahlberg didn't show the extra nipple to his friend, but he did confirm he had one.
"Yes, it's true," Wahlberg confessed, much to Ferrell's visible surprise.
"I never made it a point to show him," admitted Wahlberg. "Our conversation stopped at 'How are the kids?' and 'See the game last night?'"
Featured Image Credit: PA
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