Getting in on all the Mercedes-Benz New York Fashion Week festivities, Sienna and Savannah Miller were spotted hosting a soiree at Intermix last night (September 10).

The British sisters were all smiles as they greeted guests to their Fashion Night Out celebration, stopping along the way to pose for the paparazzi.

And both Miller girls looked great as they mingled with celebrity guests including Rihanna and fashionista/Vogue editor Anna Wintour.

Sienna has been spending most of her day in the Big Apple as she prepares for her Broadway debut in “After Miss Julie.”

Original post by http://www.gossipgirls.com