come complete with william and kate official engagement photo. you'd have to come to london to get one because they're all sold out online. there's plenty of good royal wedding news at our website cnn.com/unveiled. after the break our journey takes us to the tower of london, where we'll hear about the food that will be served, for william and kate's wedding reception. [ male announcer ] germs in your mouth build up and form a layer called biofilm so strong it survives brushing. thankfully, there's listerine® antiseptic. its triple-action formula penetrates biofilm, kills germs and protects your mouth for hours. fight biofilm with listerine®.