Swift changes a floor-length red gown to a striped t-shirt, then decamps at a diner before she jots notes backstage. “I write on whatever I can find. I write wherever I am, whenever I get an idea, in the middle of the day in the middle of the night — and I like that the commercial just really showcased that,” she said to Entertainment Tonight.
Swift does not say when the commercial will air, but she did reveal that on March 13, Diet Coke’s Facebook page will debut a video series about her life on tour: hair, makeup, the works. For now, watch the preview to her commercial up top.