This year, the singer was nominated for Best New Artist. So ... what gives?
The rules say: A "new artist" is any performer (or group) who releases, during the eligibility year, the recording that first establishes their public identity as a performer.
Which means despite "All About That Bass," having over 1.1 billion views on YouTube, reaching No. 1 in 58 countries and selling 11 million digital singles, it did not establish Trainor's public identity.
But Trainor's debut album, "Title," released in January of 2015, did.
Had Trainor won either award from last year, she would not have been eligible for Best New Artist this year. (Video via ABC)
Trainor's competition this year includes Tori Kelly, Courtney Barnett, James Bay and Sam Hunt.
This video includes images from Getty Images.