Selena Gomez has congratulated her pal Demi Lovato on the release of her new YouTube documentary 'Simply Complicated'.

Selena Gomez

Selena Gomez

The 'Sorry Not Sorry' singer released the film on the video sharing website earlier this week, and after posting a teaser on Instagram on Tuesday (19.10.17), her close pal Selena - whom she has known since they starred on 'Barney & Friends' together as children in the early 2000s - has praised the project as "beautiful".

Taking to the comments of Demi's Instagram post, 25-year-old Selena wrote: "This was beautiful. I'm so happy for you. You always continue to [be] bold and real. I wish more people were like you. Love you."

Selena's kind words come after Demi, also 25, previously shared a trailer in which she claimed she would never stop "being honest" about her previous struggles with substance abuse and eating disorders, as well her current battle with bipolar disorder.

She said in the clip: "One thing I'll never stop doing is being honest. I was not easy to work with. I'm coming up on five and a half years of sobriety. I'm on a journey to discover what it's like to be free of all demons."

The 'Confident' singer entered rehab in 2010 to seek treatment for a dependence on alcohol and drugs, as well as get therapy for an eating disorder and self-harming, and although she's been clean ever since, she admits it's still a struggle to keep herself sober.

Speaking recently about her documentary series, she said: "I think what was difficult about the process was being honest about where I am in my life today. Telling the world that I'm not the poster child for recovery. Sometimes it is a struggle, and sometimes I still deal with issues that I have suffered from in the past. It's a challenge to maintain recovery, and I talk about that in the film. So, for me, it's like kind of admitting that I'm not ... Obviously I'm not perfect, but admitting that on camera. I want to be the best role model that I can be for my fans, so by admitting that I'm not perfect, it's kind of weird for me."

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