Rooney Mara was the picture of understated elegance at a New York Fashion Week party on Thursday night, wearing a plunging little black dress with mesh insert that showed just the right amount of skin.

For the star-studded Calvin Klein Collection post-party, the 28-year-old actress kept her beauty look simple. She wore her hair slicked back into a high ponytail sectioned off into several bands, and opted for smoky green eye shadow and a nude lip.

Rooney is the face of Calvin Klein’s Downtown fragrance, having starred in two black-and-white campaigns earlier this year. Known for her striking features and preference for neutral colours, the beautiful brunette recently revealed to Hello! that she’s rather unfussy when it comes to fashion.

''My everyday style is quite lazy,” she said. “I don't have to put that much thought or effort into what I wear, which is why most of my clothes are black, white and grey. I just like it to be simple and comfortable.''

The star of films like The Girl With the Dragon Tattoo is equally low-key with her makeup routine.

''My signature look is very simple and easy,” she said. “I like to wear my hair back off my face so I don't have to worry about it. Just clean skin, strong eyebrows and sometimes a lip. I like a clean look; no tricks, no fuss, easy and simple.''