For an old-school, romantic look, consider wearing your hair down in loose, shiny waves a la Veronica Lake, as Jessica Biel did for the Tiffany & Co. Blue Book Ball on Apr. 18. The actress sported a deep side part, accentuated with a diamond brooch pinned to her tresses. Hers was a Tiffany piece, but you can get the same look on the cheap. David's Bridal sells crystal and metal clips for $18 each!