Los Angeles-based indie pop duo Capital Cities has also been added to the line up
Ariana Grande was by far the most-buzzed about artist Sunday night on the social media giant
Eclectic mix of musicians and actors set to hand out statues on Sunday
Ariana Grande also added to performers' roster
Austin Mahone, Cody Simpson and Bridgit Mendler are also up for the inaugural Artist on the Rise honor
The Nickelodeon actress-turned-singer outsold Tamar Braxton to become first female artist to debut in the top spot with initial album since Kesha.
Young pop stars will perform songs from their upcoming albums