Britney Spears and Madonna will attempt to top their infamous on-stage kiss with a 'bondage' sex show, it's claimed.

It was initially reported that Brit will be joining Madge on her 'Sticky and Sweet' world tour via a pre-recorded video, but it now seems that the recovering pop wreck may make an appearance in person.

The pair reportedly aim to shock audiences by being wrapped head-to-toe in bandages, which will gradually be unravelled by male dancers in leather thongs.

"It's classic Madonna, probably the raunchiest stuff she has ever done. It leaves nothing to the imagination and will be very controversial," says a source cited by The Sun.

"Britney and Madonna unwrap like mummies to appear together almost naked apart from tiny leather bondage pants and knee-high boots. They then dance closely together, pressing their hands and bodies together.

"There will be big rows over whether it's sexy, shocking or both."

Concert-goers will also apparently get the chance to witness Britney create her real-life breakdown during a performance of Madonna's 1995 hit Human Nature, to be shown on 20ft screens during her performance.

The source explains, "We'll see her going crazy in an enclosed space — screaming, pulling her hair and banging her fists against the lift’s walls as it gets stuck between floors.

"She really loses it."