Watch Britney's Jackass 'stunt'

Britney Spears is proving game for a laugh as she promotes her new album Femme Fatale.

Here's your chance to see her take part in a stunt for Jackass 3D. The footage doesn't make the final cut of the DVD but you'll enjoy it...if you're not scared of "poop" or "pee pee"

Basically, Britney allows herself to be locked in a portaloo which is then fired into the air by a giant catapult at which point it all gets a bit messy.

We'll leave you to decide whether it was really Britney inside.