Hey, if you've got Chanel Haute Couture, flaunt it -- repeatedly. Karl Lagerfeld customized this romantic, pale pink Chanel number for Keira Knightley to wear to a pre-Bafta party back in 2008. But the actress can't seem to keep the thing in her closet now that its raison d'etre has come and gone. Pairing the tulle number with a cropped jacket and Chanel bridal flats in Marzan, France, last spring, she used it as her wedding gown when she married James Righton. On Tuesday night, she pulled it out again, adding a sheer top with embroidered cameos to the look for a trip down the red carpet at the Serious Fun gala in London. Here's to sustainable fashion!