Beauty is pain!
The reality star posted a Snap of her legs after the event, and they looked like an annoyed cat had gone on the attack.
Girls just want to have fun!
Their latest stop was Denver, Colorado. That's when the two co-judges decided to pull a prank on Simon Cowell!
They served him up a local delicacy called Rocky Mountain oysters - otherwise known as BULL TESTICLES!
But Simon still wanted to have a little fun of his own!
He then offered up the gross grub to Paulina Rubio!
Poor Paulina! We hope she didn't fall for it!
Ch-ch-check out a shot of the tasty testicles below!
[Image via Dennis Van Tine/Future Image/WENN.]