Knightley, who is popular for her skinny frame, sported a black-and-white optical illusion dress at the Chanel show that happened earlier today, reported E! Online.
The outfit featured a full skirt with a super-tight-fitting cinched waist under a very structured crop top. The dress also sported a black bow at the neck.
She paired her high-fashion look with gold heels and a black Chanel bag.
After posing for pictures outside the Chanel show, Knightley and her rocker husband James Righton, sat together on the front row at the show.