Cropped denim and a warm wool jacket make for the perfect outfit to roam the streets of NYC in. Sienna pulls it all together with luxe earrings and a statement bag.

Sienna celebrates the opening night of her play Miss Julie in NYC in delightful sequins. Though her exact dress might be hard to obtain quite yet (it quite literally walked down the Balmain runway in Paris weeks ago), there are a plethora of sequined dresses to choose from. For those prematurely worried about what to wear to all those Christmas parties, one of these would be perfect paired with tights and chunky ankle boots.

Sienna gets glamorous for an appearance on the David Letterman show, tossing a sequin cardi over a simple black jumpsuit. This '80s-inspired silhouette keeps its feet firmly planted in the now with a sexy pair of platform sandals and minimal jewelry.

A day of errands and shopping is best tackled in denim and flats but there's no reason that the style factor has to fall flat. Sienna goes for everyday glamour by choosing studded boots, a worn-in leather bag, and her favorite bohemian denim waistcoat.