During a night out for dinner at The Church Key on Wednesday, the singer donned her gold, heart-shaped locket gifted to her by Harris, 32, for their one-year anniversary.
Swift, 26, stepped out with friends, wearing an all black jumpsuit accessorized with her signature red lip and newest token of affection draped from her neck.
The "Bad Blood" hit maker gave fans an up close look at the jewelry when she shared a pic of the necklace on Instagram on Sunday.
"3.6.15 One year down!," she captioned the photo, adding a heart emoji.
Although they're celebrating a year this month, the couple didn't publicly confirm their relationship until May of last year, after rumors that they were exclusive had been circulating for a few months.