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Britney Spears will team up with Madonna – virtually – during the singer's upcoming Sticky & Sweet tour.

"Britney is going to film something for Madonna's show in the next week or so," Madonna's rep, Liz Rosenberg, tells PEOPLE.

As for details about what they will be doing – and where it will be filmed – Rosenberg says, "I don't know. It's a secret."

Contrary to published reports, Spears is not in New York to film the video segments, nor has she already shot anything.

This isn't the first collaboration for the pop stars. The two famously teamed up during the 2003 MTV Video Music Awards, sharing the stage – and one memorable kiss – during the broadcast.

Spears is not expected to perform with Madonna, whose tour kicks off in Wales next month. The U.S. leg of her tour starts Oct. 4 in East Rutherford,


UPDATE

Britney and Madonna latest hookup has been temporarily derailed by a technical glitch.

Spears had been scheduled to begin shooting a video montage for Madonna's upcoming tour this morning at the Lots soundstage in Hollywood. But production insiders say that because the set was not finished in time, cameras will not roll until tomorrow.

The set features an elevator, in, around and on which Spears will dance.

"The video will be very deep," a source in the Spears camp tells E! News. "You've never seen Britney like this before. It will blow your mind."

Madonna reached out to Britney to do the project, says the source.

The Material One's publicist, Liz Rosenberg, would only say that "there is footage being shot of Britney some time this week in conjunction with Madonna's upcoming tour" and that the segment was not a music video.

"That is all the information I have available," the rep added. "The rest is a secret."


SOURCES
http://www.untouchablebritney.net/in..._from=&ucat=1&

http://www.untouchablebritney.net/in..._from=&ucat=1&