Taylor Swift celebrates one-year anniversary with Calvin Harris

Taylor Swift, who once sang about her boyfriends, "But I can't make them stay -- at least that's what people say," has proven everyone wrong. She and beau Calvin Harris just celebrated their one-year anniversary.

On Sunday, the singer posted a photo of a golden heart locket with the engraved date "3.6.15" on Instagram, along with a caption that said, "3.6.15 One year down!"

Harris also mentioned the anniversary on social media and posted a video on Snapchat of a chocolate frosted cake that said "1 YEAR" on it. In the video, Harris says, "One year. We got 'One year' cake," as Swift nods enthusiastically.

He also posted a tweet that showed Sylvester Stallone giving a thumbs up against a rainbow backdrop and wrote, "Mood," on Sunday.

Seems like the two lovebirds are still very happy.

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• Taylor Swift