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."
Madonna leaves Malawi after week's charity tour
Oct 31, 2009 9:00 am PDT
Madonna has left Malawi after a nearly weeklong visit with her family, airport and charity officials said Saturday. Officials said Madonna flew out of the southern African country on Friday. The 51-year-old celebrity arrived in the impove...
Madonna promises light for Malawian village
Oct 30, 2009 6:00 am PDT
Madonna has promised electricity to a village in Malawi, the impoverished southern African country where she runs a charity organization and from which she has adopted two children. Speaking in Mphandula, some 50 kilometers (30 miles) fro...
Madonna returns to Malawi to launch girls school
Oct 25, 2009 9:00 am PDT
An official for Madonna's African charity says the star has arrived in Malawi to visit the girls school she is building in the impoverished country where she adopted two children. The official who could not be named because he was not aut...
Madonna's New York neighbor sues over noise
Oct 19, 2009 11:15 am PDT
Madonna's Manhattan neighbor has sued her co-op and the building's management company saying the pop star's habit of rehearsing with loud music is a nuisance for other residents. "Madonna and one or more of her invited guest...
NYC neighbor sues Madonna over loud music, dancing
Oct 17, 2009 7:00 am PDT
One of Madonna's New York neighbors says the superstar's loud music and frequent dance sessions are causing a commotion. Karen George, of Manhattan, lives above Madonna in a building on Central Park. She said in a lawsuit filed Friday ag...