Songstress Demi Lovato has revealed that a lack of positive role models when going through her teen years contributed to the development of her eating disorder along with other issues.

During a personal interview with Nightline, the 'Skyscraper' beauty explained that celebrities she looked up to were all very thin, which both created and fed an unhealthy expectation of her own body:

"When I was growing up, I had no-one to look up to in the spotlight that was a regular-sized girl. This was the time when socialites were very, very thin and were going to clubs, and that's what I had on my wall - I had pictures of these girls that were so tiny."

She also opened up about going to rehab and explained that she was at the point where it was her only option, but looking back she's glad she recognised that she needed help:

"I knew that I was in trouble and I knew that I couldn't do it on my own. The difference is now when I don't want to eat or I want to throw up after a meal, I tell somebody, and that instantly takes away the power of what that has on me if I were to do it."

Towards the end of the interview, Lovato added that if Lindsay Lohan ever needs support while she's experiencing a stay in rehab she would gladly help her: "I love Lindsay. She's one of my friends and I will always be there if she ever reaches out, but it's not my place to give her words of advice. I can't sit here and say that I am Miss Recovery, that I'll be that way for the rest of my life."

Watch a recent interview with Lovato below: