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Singer Fergie is in negotiations to join the Rob Marshall-helmed musical "Nine" for the Weinstein Co. and Relativity Media. She joins a cast that already includes Daniel Day-Lewis, Marion Cottilard, Penelope Cruz, Kate Hudson, Nicole Kidman, Sophia Loren and Judi Dench. Role marks the Grammy-winning singer's first major role in a bigscreen project. She had a small role in the Weinstein Co.'s "Grindhouse.'' Fergie will play Saraghina, a lusty woman who introduces Guido (Day-Lewis) to the world of sexuality.