Britney Spears Catapulted Inside Port-a-Potty!

Entertainment March 30, 2011 AT 11:01AM By UsWeekly Staff

Brit against the port-a-potty!

In a Jackass segment that aired on Tuesday's Jimmy Kimmel Live, Britney Spears faced off against an icky adversary: poop.

PHOTOS: How Britney has grown up

Before performing live on the show, Spears, 29, joined Jackass star Johnny Knoxville and his raunchy pals in a pre-taped clip -- where the crew locked the pop star in a porta-potty, primed to launch into the air via bungee ropes.

Wearing goggles, Spears screams inside the portable toilet as it bounces up and down -- as what is purportedly human excrement splatters inside.

PHOTOS: Her awesome bikini bod

Spears' take on the toxic stunt?

"Just did my first @jackassworld stunt with Knoxville and company. Knoxville better watch his back," Tweeted the singer, whose new album, Femme Fatale, is out now.

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