Madonna's husband Guy Ritchie has explained how Britney Spears came to make a cameo appearance in his wife's new stage show - it was based on a real-life incident.
The pop superstar kicked off her Sticky + Sweet tour in Cardiff, Wales on Saturday (23Aug08) and the concert included a special video appearance from Spears, who is seen dancing in an elevator.
And Ritchie admits that Spears' role in the show was created after Madonna saw a video of a similar incident.
He says, "Britney in the lift is based on real footage the missus saw of someone stuck in a lift for 48 hours. The dancing is inspired by what happened inside."