LOS ANGELES, CA  [Friday Apr.13.2007]  /WMQT.com/ -- Justin Timberlake is hard at work on a new project, but it's all for another huge music star.

Teenmusic.com reports that Timberlake and Madonna are teaming up on the pop queen's upcoming album, and the two were recently seen heading into a West London studio.

Timberlake said, "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."

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