Diet Coke took another stylish step into Spring this year by announcing its second fashion collaboration with world-renowned designer Karl Lagerfeld. Launched last month the bottles have been named the ultimate accessory for this Summer. The contemporary collection features three designs including polkadots, pink swirls and studded stars. Personally my fave has to be the stars! They are available individually or as a set in an exclusive prism-shaped collector's box created by the designer.