Amanda Seyfried’s red-carpet hair is a modern take on a classic style, like Rita Hayworth’s hair in the fifties,” says John Frieda international creative consultant Harry Josh, who has coiffed Amanda for photo shoots. “Work hair in one-inch sections around a curling iron, and mist with something light, like John Frieda Sheer Blonde Crystal Clear Hairspray. Then, the most important part is to brush, brush, brush it out!