Celebrity Taylor Swift and Calvin Harris Celebrate Their One-Year Anniversary with Cake and Jewelry By Gillian Koenig Updated on March 7, 2016 @ 10:30AM Pin Share Tweet Email Photo: Kevin Mazur/BMA2015/WireImage Well, that was swift! It seems like just yesterday that Calvin Harris and Taylor Swift made their relationship official, but Sunday in fact marked the one-year anniversary for the adorable lovebirds. The duo celebrated the special occasion in sweet fashion, taking to social media to mark the milestone. The “22” singer shared a picture of a gorgeous gold heart-shaped locket, presumably from Harris, featuring the engraving “3.6.15 One year down!” Harris also took to Snapchat to share their “one-year cake,” which boasted two frosted hearts and looked to be homemade. "We got a one-year-cake," he says in the clip as he pans over the dessert to Swift, who smiles and nods at the camera. PHOTOS: Taylor Swift's Best Street Style Looks It seems Swift may have met her match in the low-key record producer—we can’t wait to see what comes next for this duo! Their relationship certainly appears to be a “Love Story” meant to last.