The same mind-set rang true when it came to Emma's hairstyle. Celebrity stylist Mara Roszak for Moroccanoil explained, "I felt it should play against the dress and look sleek in an effortless, textured way." To do this, Roszak spritzed Moroccanoil Luminous hair spray strong ($21) on Emma's blow-dried strands. She then pulled Emma's hair back low at the nape, twisted it into a knot, and tucked the ends under. A Cartier diamond brooch was attached at the back for a chic finish. Polish suggestions: Revlon ColorStay nail enamel in Stormy Night ($8) or Chanel le Vernis nail color in Beige ($25).