Britney Spears' Cut Scene From 'Jackass 3D' (Video)

Johnny Knoxville revealed the clip on "Jimmy Kimmel Live!" Tuesday.

Britney Spears filmed a scene for Jackass 3D -- but it never made it into the movie, Johnny Knoxville joked in a skit on Jimmy Kimmel Live! Tuesday night.

"We had to cut the bit because of time," Knoxville says.

Spears agreed to do the "Poo Cocktail Supreme" stunt, in which she was placed inside a Porta-Potty and flipped into the air via bungee cord.

"She was so game to shoot," says Knoxville. Watch above.

Spears also performed on Kimmel to promote her new album, Femme Fatale, Tuesday night.