Madonna will always re-invent herself !

Justin Timberlake is writing songs for Madonna.The Grammy award-winning star has revealed he is collaborating with Madonna on her new album, and was in a London studio with her yesterday. Justin told Britain's The Sun newspaper: "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."The 'SexyBack' singer is in London preparing for the UK leg of his world tour. Madonna - who has continuously re-invented herself throughout her career -is reportedly for her new LP to have an R 'n' B influence and has also enlisted the services of top producer Timbaland.Timbaland has masterminded hits for Justin and Nelly Furtado and is desperate to help Britney Spears re-launch her career. Madonna, 48, will headline this summer's Live Earth concert in London.