Here's proof.
Some people on the internet think that Selena's knees look like the face of a baby.
There's even a blog dedicated to the cause.
Source: onemillionproblems.tumblr.com
But it's pretty clear to me that it's actually DEMONS that live inside her knees.
Source: FameFlynet Pictures
Yup, definitely demons.
Image by Jag Gundu / Getty Images
Sometimes the knee-demons are happy!
Image by Christopher Polk / Getty Images