Katy Perry has assured fans the traffic accident she caused in her new video for Birthday was staged.

In character as drunken clown Kriss, the pop star wanders off, blindfolded, from a kids' park party and into traffic on a nearby road, causing an Suv (Sports Utility Vehicle) to swerve to avoid hitting her. The vehicle then crashes into a parked car.

But the stunt was staged as part of Perry's new hidden camera video, in which she goes undercover as the world's worst party performers.

She says, "That was a staged incident. The car crash was all staged."

And she reveals she had to con party planners into thinking they were taking part in a reality Tv show as she dressed up as an aged burlesque dancer, a mouse-eating animal trainer, a chubby Jewish Mc