Shawn Mendes was put on the hot seat for Vanity Fair’s infamous lie detector test on Monday. The Canadian singer, 23, nervously laughed through a series of questions while hooked up to a lie detector, dishing about girlfriend Camila Cabello, his pal Taylor Swift’s boyfriend Joe Alwyn, and, more notably, his idol Justin Bieber and his wife Hailey Baldwin, whom he infamously attended the Met Gala with in 2018.