Why Kate Middleton's knee has everyone puzzled

Kate Middleton is always going to grab the world's attention.

But recently, the public have been noticing something totally bizarre about her!

The internet has hysterically been comparing Duchess of Cambridge’s knee to Casper the Friendly Ghost.

The strange comparison was made by web users on a Reddit forum.

Some users argued her knee looks more like an alien baby.

But Kate's not the only one - the phenomenon seems to be relatively common.

In fact, a whole thread on Reddit has been dedicated to the subject of people with faces on their knees.

We bet you're looking at your own knees now!