Spears & Rihanna stun Vegas crowd at the Billboard Music Awards

Britney Spears and Rihanna got the Billboard Music Awards off to a steamy start in Las Vegas on Sunday night (22May11) by performing the R&B star's S&M together as pseudo-strippers.

Both pin-ups wore matching leather bodices - Britney's was black and Rihanna's white - and the girls writhed around the stage and pole danced as they performed the sexy hit, with their hands clamped with handcuffs, attached by chains.

Spears made a grand entrance in the middle of the song - seated on a chair which rose up from beneath the stage with a sado-masochistic bunny mask on her face.

The crowd went wild at the MGM Grand arena as they realized who Rihanna's special guest was.