New Delhi, Aug 11 (ANI): Hollywood singer Demi Lovato, who was recently shifted from the hospital to a rehabilitation centre following a drug overdose, has left for Chicago for a psychiatric treatment. According to TMZ, the 25-year-old singer has reached Chicago to see a psychiatrist specialising in mental health and sobriety. Demi will undergo psychiatric treatment for a few days after which she will get back to the rehabilitation centre. The singer, who is known for her struggle with drugs for years, gave fans a sneak peek into her life when she talked about it in the documentary- 'Simply Complicated'. Demi even opened up about her addiction to drugs in her single 'Sober', which was released in June.