Jennifer Lawrence at the movie premiere of THE HUNGER GAMES: MOCKINGJAY PART 1 at the Nokia Theatre L.A. Live on November 17, 2014 in Los Angeles, California.
Jennifer, a brand ambassador for the House of Dior, is wearing a gown from the Christian Dior Fall 2014 Couture Collection. Looking back on Jennifer's Christian Dior red carpet wardrobe, I think she fares better in Christian Dior Couture than Ready-to-Wear.
Here's the look from the Christian Dior Fall 2014 Couture Collection Paris presentation. I prefer the full gown.