Jessica Chastain delivered the drama at the 12th annual Breakthrough Prize ceremony. Chastain, 49, attended the Saturday, April 18, event in Los Angeles dressed to impress in a strapless Oscar de la Renta gown with golden floral appliqués. The look complemented the actress' brand-new bob that was chopped to her chin. "Choppity chop," Chastain wrote via Instagram on Sunday, April 19, sharing footage of hairstylist Renato Campora cutting her long tresses. In a post on his own page, Campora noted that he gave Chastain a "fresh haircut" in time for the Breakthrough Prize.