Demi Lovato has left hospital and entered rehab.

The 'Sober' singer was taken to Cedars-Sinai Medical Centre in Los Angeles almost two weeks ago following an alleged overdose but she was discharged from the medical facility on Saturday (05.08.18) and boarded a private plane to an unnamed facility outside of California.

According to TMZ, there is no time frame for how long the 25-year-old star will spend in the clinic, which is described as one of the nation's ''leading facilities for addiction'' but she is expected to be there for at least a month.

Demi's move to rehab comes after she broke her silence over the weekend and thanked fans for their support as she vowed to do whatever she could to get back on the ''road to recovery.

She wrote in an open letter posted on Instagram: ''I have always been transparent about my journey with addiction. What I've learned is that this illness is not something that disappears or fades with time. It is something I must continue to overcome and have not done yet. I want to thank God for keeping me alive and well. To my fans, I am forever grateful for all of your love and support throughout this past week and beyond. Your positive thoughts and prayers have helped me navigate through this difficult time.

''I now need time to heal and focus on my sobriety and road to recovery. The love you have all shown will never be forgotten and I look forward to the day where I can say I came out on the other side. I will keep fighting.''

Demi - who has battled with drugs and alcohol abuse in the past - had stayed away from substances for six years but she recently revealed that she had fallen off the wagon when she released her song 'Sober' in June.