"This past year has been one of the hardest years of my life and I feel it's time share that with you guys. To cut a long story short things got really dark," she revealed on Instagram, while sharing a Twelve Steps image showing she's been one year sober.
"I gave up on everything in my life but most of all I gave up on myself. Life on life's terms became to much for me to handle. The only way I knew how to function was to self medicate and go from project to project so I never had to focus on what was really going on with me," she continued. "Something had to give... and it did."
"I have spend the past year truly working on my mind body and soul! I had to take a step out of the public eye away from work and give myself a chance to heal and figure out who the f--k I really am without a camera in my face," she continued.
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She then turned her attention to all the family members and friends who have supported her through it all.
"I want to take this time to thank my brother @jackosbourne who answered the phone to me one year ago today and picked me up from where I had fallen yet again without judgment," she wrote. "He has held my hand through out this whole process. Thank you to my Mum and Dad for never giving up on me. I love my family with all my heart."
"I can't believe It's been a year!!! I still don't know who the f--k I am or what the f--k I want but I can whole heartedly confess that I'm finally at peace with myself and truly starting to understand what true happiness is," she concluded. "I'm sorry if I let anyone down it was just time for me to work on me! I love you guys!"
Her reveal comes after Osbourne spoke out about Demi Lovato's recent relapse and subsequent hospitalization, saying it's "one of the hardest things we face as an open addict."
Osbourne also wanted to make it clear that there is no cure for addiction; it's a disease an addict learns to cope with and manage.
"People need to know rehab doesn't fix you, it just helps you to get yourself on the right track," she said. "You're never fixed. You spend your whole entire life doing everything you can to never pick up and use again."