Prince William and Kate Middletonhave so much in common.

However, William and Kate share a similar physical trait that fans may have never noticed.

Kate surprisingly has a three-inch scar that runs down the left side of her head.

Prince William attends an event

However, it has been visible on several occasions to anyone looking hard enough.

However, no further details were given (viaHello!

Kate is known for being quite the athlete, so the scar may have resulted from a sports injury.

Prince William smiles at an event.

However, she’s keeping that secret under wraps.

Meanwhile, William also has an interesting scar on his head.

In fact, her husband Prince William also had an injury that left him with a permanent mark.

William says that sometimes the scar is very noticeable, and other times it’s nearly undetectable.

The outlet also reports that the scar came from a golf injury that was likely a painful one.