How well did the cast of “Nine” get along? “Singingly,” according to Marion Cotillard, who plays the actress wife of a cad (Daniel Day-Lewis). For one party, producer Harvey Weinstein took over a rural English pub and brought his own karaoke machine. Cotillard, Nicole Kidman, Penelope Cruz, Fergie and Kate Hudson drew tunes out of a jar. Weinstein confessed to us at a star-studded Per Se luncheon, “Somehow my name never gets drawn to sing.” Cotillard laughed, “It’s simple. He cheats!”