Britney Spears To Film Video For Madonna's Sticky & Sweet Tour

Madonna personally requested Spears' participation, one source says.

Five years after they famously locked lips at the 2003 MTV Video Music Awards, Madonna and Britney Spears are set to work together again. This time, however, their hook-up will be long-distance.

According to People magazine, Spears is slated to film a video piece soon that will be included as part of the stage show for Madonna's upcoming Sticky & Sweet Tour. "Britney is going to film something for Madonna's show in the next week or so," said Madonna's longtime spokesperson, Liz Rosenberg, according to the magazine. Details on what the clip will include, however, were scarce, as Rosenberg declined to comment on what role Spears will play in the production or where she will be filming. "I don't know. It's a secret," she said.

She did, however, deny published reports that Spears is in New York to film the video and that she's already shot the bit. This would be the second high-profile cameo for Spears in the past month. She shot some footage for the Pussycat Dolls' "When I Grow Up" video last month, but her part was left on the cutting-room floor at the last minute.

An unnamed source told that "Madonna specifically asked to work with Britney again." The singers have not shared a stage since the infamous VMA kiss, but Madonna did speak out in Spears' defense earlier this year when the singer was going through some hard personal times.

In March, Madonna — who is under the tabloid microscope herself these days due to since-refuted rumors of a possible divorce and an alleged relationship with Yankees star Alex Rodriguez — told the "Yo on E!" satellite radio show that the media needed to "step off" Spears and give her some room. "For real ... let's go save her," Madonna said, adding that she thought her 11-year-old daughter, Lourdes, was aware of what was going on with the pop star and felt "very protective of Spears."

At the time, Madonna also said she was digging Spears' Blackout album, which she listened to while working out.

Spears' manager, Larry Rudolph, confirmed to "Access Hollywood" that the video tribute would be taking place but quashed rumors that Spears would actually be touring with or performing live with Madonna. The Sticky & Sweet Tour kicks off in the U.S. on October 4 in East Rutherford, New Jersey.