Sienna Miller is a lady what acts, a lady what models, a lady what plays the fashion game - and you know what? She even dabbles politics. Is there NOTHING she can't do?
Being an ambassador for the International Medical Corps the Brit beauty was at the Clinton Global Initiative in New York City this week - supporting many a good cause and looking super sharp.
Sienna even hosted an International Medical Corps' reception (wearing an embroidered off shoulder dress by Alexander McQueen) during the three day event.
Yes, the do-good gal proved that when it comes to rallying up awareness and medical support across the globe for countries during war and natural disasters - she's on the case. She's backing the "First Responders" all the way.
Looking the business Sienna wore a crisp white shirt, a lightweight blazer, skinny black jeans and ankle boots. The oversized navy Autumn coat thrown over her arm - this is EXACTLY how to do smart-casual. The lady done good.
Take a look through this gallery to see more of Sienna's head-turning style...