Will.i.am has leaked a snippet of a song he has produced for Britney Spears' forthcoming album, 'Femme Fatale'.

The Black Eyed Peas star said he created the song, entitled 'The Big Fat Bass', during a flight from Japan to Los Angeles.

"Thank you Britney for collaborating it was a pleasure working with you. Thank you for trusting my instincts. You're a doll," will.i.am said in a message on Twitter.

He added: “I hope your Britney army likes it as much as we do."

'Femme Fatale', released March 29,also includes production from her long-time partners Dr. Luke and Max Martin, as well as Rodney Jerkins, Stargate, Fraser T. Smith and Bloodshy & Avant.

(by Jason Gregory)