Watch: #DemiLovato Sings #ArianaGrande’s ‘Bang Bang’ Verse At #JessieJ Concert

Demi Lovato and Jessie J perform together at 99.7 NOW!’s 2014 Triple Ho Show in San Jose, CA last night. The singers were on the lineup at the concert, but Demi surprised the crowd during Jessie‘s set by joining her for “Bang Bang” and singing Ariana Grande‘s part. Check out the video below.