The 26-year-old singer and DJ/music producer, 32, have broken up, multiple sources confirm to ET. The former couple celebrated their one-year anniversary in March with an adorable cake, a custom locket and plenty of fawning over each other on social media.
Shortly after their anniversary, Swift and Harris marked the occasion with a romantic tropical vacation together, where the duo once known as Tayvin posed for each other's Instagram pics and wrote their names in the sand. (Adam Wiles is Harris' given name.)
In April, Swift gushed about being in a "magical relationship" to Vogue, saying, "Of course I want it to be ours, and low-key. This is the one thing that's been mine about my personal life."
Around the same time, Harris opened up to a radio station about how "fantastic" Swift is.
Though Swift has shown no sign of the split on her social media pages, neither has deleted any pictures with the other -- including a pic of the "Blank Space" singer wearing a Calvin Harris jacket when she stepped out to support him at Coachella.
The breakup news comes less than two weeks after the Scottish DJ was in a car crash on May 21 that briefly landed him in the hospital. Harris canceled two Las Vegas shows to recover beforesurfacing on Snapchat in London.