Taylor Swift‘s first task as Diet Coke’s program ambassador: star in a commercial. Filmed in Nashville, Swift’s Diet Coke ad follows the pop sensation as she scrawls the lyrics to current single “22″ in a well-worn notebook — at her bedroom, inside a diner and while backstage. While “22″ is easily one of Red‘s best tracks, and Swift is charming as always, the commercial’s most endearing moments may be the seemingly inevitable sing-alongs, filmed during a commute, a kitchen shift and on karaoke night. They’re scripted, yes, but they also ring true.
Check out Swift’s Diet Coke commercial up top, then watch its television premiere on tonight’s American Idol.