Uhhhhhh, what? Meghan Trainor and Charlie Puth capped off their duet performance of "Marvin Gaye" during Sunday's American Music Awards by making out ... for a while. Guess they took some advice from their own song and decided to get it on. We can't confirm if this super subtle act was a way to announce a new relationship, but we can confidently say Marvin Gaye would approve.