Before Britney Spears took to the stage of ‘Jimmy Kimmel Live‘ to perform her new single, Johnny Knoxville shared footage of the ‘Jackass 3D’ gang subjecting the pop star to horrific levels of human excrement.

That’s Poop.

Britney claims she’s not afraid of “poo-poo.” But what about the “poo cocktail supreme”?

They lock her in a porta-potty lodged between bungee ropes. As the portable toilet soars through the air, bouncing up and down, human waste splatters throughout the inside, across the camera and all over Spears.

I love how she chases them down — punching Johnny in the balls.

Perhaps the grossest aspect of the ordeal is that she keeps screaming — so her mouth is open the whole time.

Spears tweeted about the stunt on Tuesday: “Just did my first @jackassworld stunt with Knoxville and company. Knoxville better watch his back… -Britney.”

This might have been her first stunt — but after eating poop, I’m guessing it will be her last one too.

BONUS: Jimmy Kimmel and Britney Spears get tattoos