Shawn Mendes and Camila Cabello are definitely an item now, they weren't always forthcoming about their feelings for one another. The 22-year-old «Treat You Better» singer appeared on Monday's episode of where the British host shared a 2015 clip of Mendes and Cabello denying they had ever dated or hooked up. Cringing and watching through his fingers, Mendes and fellow guest Matthew McConaughey laughed about the clip. «It's hard, it's really hard,» Mendes told Corden of seeing the clip.