Camila Cabello and Shawn Mendes might show some serious PDA when they're out and about [1], but going from friends to significant others wasn't easy at first. On Thursday's episode of The Tonight Show Starring Jimmy Fallon [2], the 22-year-old "Cry For Me" singer [3] revealed it was difficult for her to see Shawn as her boyfriend after they had been friends for five years [4]. In fact, it was so hard, she couldn't even call him a lovey pet name. "It took me like two months to be able to call him 'baby,'" she said. "I'd just be like, 'Hey . . . you, can you hand me that water over there?' It's weird, but it's great."

But the couple seem to be pretty comfy in their romance now (need I remind you of their makeout Instagram video [5]?). Watch Camila talk more about their awkward phase and reflect on their friendship in the clip above!