Jennifer Lawrence along with Jodie Foster presented the Oscar for Best Actress. They were both Casey Affleck's replacement this yea. He said back in January he would not be attending the Oscars because he did not want to be a distraction from the women being awarded. It is tradition that the Oscar for Best Actress is presented by the prior year's Oscar winner for Best Actor. Jennifer Lawrence looked stunning in this metal sequins dress that she wore to the Oscars. She kept it very simple with her wavy blond hair.