The actress looked lovely in a short black coat dress with pink and black pointy high heels.
The film stars Bradley Cooper as Pat, a bipolar man who spends eight months in a mental hospital. He becomes friends with a depressed young woman (Lawrence), who's mourning the death of her husband by having compulsive sex with nearly everyone she meets.
The film, which is a possible Oscar contender, hits theaters on Nov. 21.
See more photos of Jennifer...