23-year-old superstar Taylor Swift recently signed a deal with Diet Coke for a series of branding initiative, including this television spot. Now, the brand launches a limited-edition Diet Coke can featuring the signature of Ms. Swift, with a handwritten quote adorning it -- "If you're lucky enough to be different, don't ever change." The can is also taller and slimmer than regular soda cans -- part of the brand's "Sleek" can line -- and was designed by design company Turner Duckworth. The can will arrive on shelves in October.