Natalie Portman tried to stay warm next to costar Vincent Cassel while shooting scenes for Black Swan in NYC yesterday. The actress is also starring alongside — and kissingMila Kunis in the dance film. Natalie's movie romances were a topic of conversation recently when she talked about choosing when to do sex scenes. For now, we can see her acting out a complicated love life in Brothers, which held its own at the box office this weekend.

To see more of Natalie on set, just