The former Jonas Brothers singer, who parted ways with the band four months ago, shares the same manager as the 'Let It Go' hitmaker and was thrilled to be offered the position ahead of the tour, which kicks off on February 9 in Vancouver.
He told Rolling Stone: ''I'm overseeing video content, wardrobe, lighting and staging. And then I'm extending into the musical side of things, which includes creating the arrangements for the songs.
''I'm building what Demi wanted, which is a show without stops and starts.''
The 21-year-old performer, who was previously in a band with his brothers Kevin, 26, and Joe, 24, and has been close friends with Demi for a number of years.
He continued: ''I was immediately excited when I was offered the position. The relationship that Demi and I had over eight years really gives me the insight into how to best communicate with her and her team.''
The tour will feature tracks from all four of Demi's studio albums, including 2008's 'Don't Forget', and Nick has been in rehearsals with the band for the past two weeks.
He said: ''The biggest challenge has been just trying to rethink some of the music and see how we could compliment it with lights and video.''
The singer is also focusing on his own material and says he has ''a lot of things in the pipeline''.
He added: ''I'm waiting to release some news about my music and my next steps. It isn't quite locked in yet, but I have started making some music and now its all about lining up the pieces.''
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