"I Know What You Did Last Summer" by Shawn Mendes and Camila Cabello
This song is super catchy and showcases just how well Mendes and Cabello can work together. Released in 2015, both Mendes and Cabello were still coming into their own when it comes to music (Cabello was still a part of Fifth Harmony at this point). This duet only foreshadows even better music to come from both artists!