Madonna and
Britney Spears are set to perform a bondage routine together.
The pop superstars - who caused controversy when they shared a kiss at the MTV Music Awards in 2003 - will appear in bandages which they will remove to reveal tiny bondage pants and knee-high boots.
The footage, which will include the pair gyrating against each other, will be screened to fans on Madonna's Sticky and Sweet world tour via giant video screens.
A source said: "It is classic Madonna, probably the raunchiest stuff she has ever done. It leaves nothing to the imagination and it will be very controversial.
"Britney and Madonna are unwrapped 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.