In December 2017, Trainor was announced as one of the judges on the Fox show The Four: Battle for Stardom, alongside Sean Combs, DJ Khaled and Charlie Walk.
Dibulan Desember 2017, Trainor diumumkan menjadi salah satu j di acara televisi The Four: Battle for Stardom yang tayang di Fox, bersama Sean Combs, DJ Khaled dan Charlie Walk.