Insiders are calling the Britney Spears video collabo Madonna has come up with for her Sticky & Sweet Tour “the raunchiest performance of her career.” (And when it’s Madonna we’re talking about, that’s really saying something!) The pop tart and the pop legend have choreographed a routine that will include mummy costumes, passionate caressing, and lots of lezzie lovin’.

“It’s absolutely classic Madonna. Probably the raunchiest stuff she has ever done. It leaves nothing to the imagination and will be very controversial,” a tabloid spy reveals to the British Daily Mail.

“There will be big rows over whether it is sexy, shocking or both.”

Britney closes out the video with a performance to Madge’s 1995 single “Human Nature.”