By FIONA ROBERTS
Unique: Extra nipples are usually found above the bellybutton, and doctors say it's the first time they have ever seen one on somebody's foot
Lily Allen proudly showed hers off on television, Mark Wahlberg's famous for his and just last week, Zac Efron was forced to deny he has two.
But a 22-year-old woman has trumped them all - by growing a full-sized extra nipple on the sole of her foot.
Although one in 50 women and one in 100 men have extra nipples, according to the California-based Dermatology Journal it's the first time one has ever been discovered so far down somebody's body.
The woman told doctors she had had the unusual growth - which is almost two inches wide - all her life, and it had never caused her any pain.
Between one and five per cent of the population have the condition, known as supernumerary breast tissue.
Fully-formed: The 22-year-old woman told doctors she has had the nipple all her life. It measures almost two inches across, and doesn't cause her any pain
Although most of the time extra nipples are found along the milk lines, which run from the genitals to the armpits, they have been discovered on the back, thigh or even the face - but never the feet.
Mark Wahlberg has a third nipple just below his left one. The former Calvin Klein model considered having it removed but then changed his mind, calling it his most 'prized possession'.
Something in common: But while Mark Wahlberg, right, is proud of his third nipple, Zac Efron has denied claims he has two extra ones on his chest