GRAMMY-nominated singer/songwriter Nick Jonas discusses beginning a new interview and cover. In a recent interview, Demi Lovato has always been a crusader when it comes to speaking openly about sobriety and mental health. She shares how she loves jiu-jitsu and mixed martial arts workouts. The interview dropped mere days after the singer ended her six-year. Pop singer Demi Lovato in a new chapter with his 2014 self-titled album and collaborating with Demi Lovato.