Watch Demi Lovato Rip Through ‘Substance’ Rehearsal With New Guitarist Nita Strauss

Demi Lovato shares a video from their rehearsal as they prepare for world tour in August

'I really rarely think about substances': Demi Lovato opens up about sobriety in interview

Demi Lovato Sympathizes With Shawn Mendes For Prioritizing Mental Health Over Career: 'I Know What It's Like'