Madonna to collaborate with Justin Timberlake

Justin Timberlake, Timbaland, and Pharrell Williams are among the collaborators working on the new Madonna album, according to reports.

The star-studded roll call of musicians are understood to be writing and producing songs for the follow-up to 2005's Confessions On A Dancefloor.

Speaking about the new material, which is due for release by the end of 2007, Justin confirmed: "I have been working on some new music.

"But it's not for myself--I'm writing for other people. I'm working on some stuff for Madonna," he explained after apparently going into a West London studio with the pop icon.

Felix Da Housecat is also rumored to be working on the LP, although there is no confirmation if Stuart Price, who produced the last Madonna album, is involved.

A "source" told London parer The Sun: "Confessions was a worldwide smash--but this will be different once again. The last album was a credible disco record and Madonna wants to give hip-hop the same treatment this time.

"It's not all hip-hop though, there are a lot of producers from a lot of genres in there. It could be her most ambitious project yet."