Kate Middleton’s knee is SCARING THE LIFE OUT OF ALL OF US.

We humans have long pondered whether spirits walk among us; whether lost souls in limbo are haunting our creaky hallways, lurking in dusty attics or pinching socks from the dryer.

Now, finally, we have proof.

Irrefutable photographic evidence uncovered by a Reddit user shows an actual, real-life ghost taking corporeal form in the Duchess of Cambridge’s knee.

Begone, demon! Image: Getty.

The image shows the 35-year-old casually strolling around outside London's Victoria and Albert Museum on Thursday, seemingly unaware or unperturbed that her meniscus is playing host to an otherworldly being.

A being that bares a striking resemblance to Casper, The Friendly Ghost. Or a jelly baby.

The palace is yet to comment.

Source: Screenshot/Amblin Entertainment.

Meanwhile, spurned on by coverage of this supernatural event, internet sleuths have unearthed disturbing evidence suggesting similar phenomena occurring in the joints of other public figures.

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Including young US singers Selena Gomez...

Image: Getty.

And Miley Cyrus.

Ghost of an angry toddler. Image: Getty.

Two pressing questions remain:

Who are they?

And what do they want with our celebrities?

Speaking of ghosts... Patrick please leave Nina alone.

Have you ever had a ghost living in your kneecap? Tell us about it in the comments below.

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