Demi Lovato has revealed the fear of not getting to see her little sister Madison De La Garza was what finally led to her agreeing to seek help for her drug addiction issues.

The Skyscraper hitmaker spent time in rehab in 2010 and 2011 in order to deal with her addiction to drugs, as well as issues with bulimia, depression, and cutting, but it took some convincing to make Lovato realise she needed professional help before things became much worse.

In a candid interview with Access Hollywood, the 21 year old recalls the moment she finally decided to turn her life around, and it was all thanks to her 11-year-old actress half-sister, De La Garza, who played Eva Longoria's daughter on Desperate Housewives.

Lovato says, "The last time that I had an intervention, it was my management, my entire team, manager, lawyers, everyone and my parents coming into a room saying if you don't get sober - my mom specifically said, 'You know, we’re going to move back to Texas and you're not going to be able to be around your little sister'."

Lovato's mother, Dianna De La Garza adds, "I couldn't allow her, at that point, to be around her little sister because of the things that we found out, that really were going on.

"I had to set an example for Madison... I had to protect her and Demi knew that. So when I said, 'I'm moving back to Texas', she knew that I finally meant it that time, and that's when we all sat down with her and said, 'This is it, you have to make a change or we're all going our separate ways because, if you don't want this career, we're not going to want it for you.'

"And that’s when the big turnaround happened. It happened that night, that very night."