While on the show, she revealed that she was once banned from seeing her little sister, Madison De La Garza, as her family was concerned about her substance abuse.
According to The Daily Mail, Demi revealed how urgent the situation was and how she was given ultimatums.
"The final one, everyone was like, 'We are no longer going to leave, we are leaving.' That was the moment when I thought, 'Okay, I really need to get help and get sober.' This time I knew... I had to hit rock bottom and I just needed to do this for myself,'" she said.
She also revealed that not being able to see her sister was the hardest thing ever.
"I knew that I had a lot of life ahead of me but one of the main reasons of getting sober was so that I could be around my little sister because my mum and dad [said I couldn't be around her] if I was doing stuff."
Demi got clean in 2012, and has made sure to mark the anniversary on social media each year.
In March this year, she celebrated five years being sober, captioning it, "It's been quite the journey. So many ups and downs. So many times I wanted to relapse but sat on my hands and begged God to relieve the obsession. I'm so proud of myself but I couldn't have done it without my higher power (God), my family, friends, and everyone else who supported me."