Diet Coke, Magnum ice cream, there seems to be no limits on what products Karl Lagerfeld will happily attach his name to. And why not? The French designer recently unveiled the designs for his latest collaboration with Diet Coke, in which he gives the iconic bottles a stylish makeover. To promote the collection, Lagerfeld enlisted the help of Coca Rocha, Heidi Mount and Jeneil Williams to star in a campaign. In this video, hear Karl talk about the inspirations behind the bottle designs, and why it was a "pleasure" to do the campaign for Diet Coke which he drinks "night and day."

Earlier this week, Lagerfeld launched the limited edition collection at a glittering soiree in Paris. Celebrities in attendance included Lily Cole (who has reverted back to her famous red hair) and Lou Doillon - click on to see a video from the launch...