Camila Cabello and Shawn Mendes may have only started officially dating over the summer, but their romance started percolating long before this year. In fact, they were all up in their feelings when they joined forces to write "I Know What You Did Last Summer" — and that was in 2015!

The "Living Proof" singer recently confessed to Rolling Stone the moment when she started developing feelings for her now-beau. “I really bonded with him as more than a friend. I think he did, too, but we were both really young, and he was experiencing the pressures of his career. I don’t think we knew what to do with those feelings,” she said about those writing sessions. “It was this awkward thing where we both liked each other, but we weren’t together. It was just weird. An energy was there from the beginning, but after that song, we didn’t spend as much time together.”

Cabello went on to date Matthew Hussey for 18 months, but love finds a way and not long after calling it quits with the YouTube star things fell into place with Mendes. The two have since fallen head over heels for each other and even got tattoos together recently.