Shawn Mendes joined the gorgeous crop of hot guys [1] at Wednesday night's People's Choice Awards in LA, and he's been having quite the night! Not only did he grace the winner's list [2] and give an adorable acceptance speech [3], but he took the stage with his rumored girlfriend of three months [4], Fifth Harmony's Camila Cabello. Watch the video above to see the stellar new renditions of "Stitches" and "I Know What You Did Last Summer."