British actress Sienna Miller was left red-faced when the designer gown she was wearing at the opening of a New York opera tore just below her bust. The CASANOVA star was attending the opening night of MADAME BUTTERFLY on Monday (25SEP06) when a gaping hole appeared in her silver silk and organza outfit, by British designers Marchesa. How the rip occurred was not explained, however Sienna, who was in New York with her on-off boyfriend, actor Jude Law, still managed to wow the crowds on the red carpet.