Zac Efron, Carrie Underwood, and More Stars You Didn't Know Have a Third Nipple

Considering how often we see perfectly toned bodies on our TV screens, it's easy to assume that celebrities have no physical flaws. However, there are quite a few who have deformities, like extra body parts and webbed toes, but perhaps the most fascinating is the case of the third nipple.

According to research, it's estimated that one in every 500 people have more than two nipples, and in most cases, they're actually mistaken for birthmarks. But if you think that's mind blowing, you'll be shocked to know that there are people who have as many as eight (yes, eight) additional ones.

We have yet to find a celebrity who has that many (wouldn't that be mind-boggling?), but stars like Mark Wahlberg have been pretty vocal about how proud they are of their prized extra nipples. On the other hand, stars like Carrie Underwood are among the many who actually mistook theirs for a mole — and she eventually decided to get hers removed.

"It really just looked like a mole. If I were in a two-piece bathing suit, people would ask me what it was, and I said it was a birthmark because it was, but I kind of got a little self-conscious of it,” Carrie said.

We imagine that there are even more celebs who probably feel the same way, but at the end of the day, it only makes their bodies all the more unique! Check out the gallery below to see which celebrities have more than two nipples.