From a punky, pink-streaked ponytail at last year’s gala to this season’s forties-style chignon, Diane Kruger is always one to watch climb the crimson-colored stairs at the Met. And while a side part and glamorous waves were trending tonight (thanks to Taylor Swift, Blake Lively, Gisele Bündchen, Chanel Iman, and countless others), this neck-grazing classic is a look worth copying.   Here, the quick how-to from Kruger’s hair pro, Miki:...