Sienna Miller wore a stunning and sexy little black dress to Monday evening's Moet and Chandon event in New York City.The 40-year-old actress put on a leggy display in the strapless mini dress, which also had a plunging neckline.The blonde beauty bared her perky cleavage and the frock's front had a round cutout that showed her taut midriff. Outstanding! Sienna Miller wore a stunning and sexy little black dress to Monday evening's Moet and Chandon event in New York CityThe Anatomy Of A Scandal star wore her lustrous blond locks in light, sultry waves that fell over her shoulders.Her look was styled in a flattering center part that flashed her darker roots and framed her face. The longtime entertainer looked typically beautiful in a face of complementary makeup.Miller's eyebrows were expertly shaped and she dusted pink blush along the apples of her cheeks, finishing with a matching matte lip stain.