Britney Spears will wow fans at Madonna's upcoming concerts by snarling her famous "It's Britney, b**ch" catchphrase on a huge screen, while prowling around an elevator like a caged beast.

Spears has shot her movie segment for pal Madonna's Sweet + Sticky tour at a studio lot in West Hollywood and now details of the short film are leaking out.

Spears, wearing a grey hooded sweatshirt, paces back and forth in an elevator as cameras catch her kicking and punching the walls.

As Madonna fans ask themselves who the angry hooded woman is, Spears pulls her hood down and delivers her catchphrase into the camera.

Madonna's Sticky + Sweet tour, which will feature the Britney movie, kicks off on October 4th in East Rutherford, New Jersey.