Demi Lovato has ''truly turned her life around'' following her overdose in July.

The 26-year-old singer has been in rehab ever since she was discharged from hospital following her life threatening overdose at her LA home over the summer, and after recently completing 90 days in the treatment facility, sources say she's ''happy and healthy'', and working toward turning her life around.

An insider said: ''Demi is happy and healthy has done a complete 180 since she overdosed. Her 90 days in rehab have truly turned her life around. She wants to remain out of rehab. She has a sober coach and a complete support system.''

The 'Sober' singer is said to have ''dedicated herself'' to a life of sobriety following several years of struggling with addiction, and is thought to be distancing herself from her old friend group who had ''supported her precarious lifestyle'' in the past.

A source added to 'Entertainment Tonight': ''Demi has struggled for so long with addiction and her friends and family couldn't be more proud of her work. This process has been incredibly beneficial to Demi in so many ways. She is not only clean and sober but she has an entirely new lifestyle.

''[She] has dedicated herself to her sober life and has surrounded herself with people in her program. She is avoiding those in her social circle that supported her precarious lifestyle. Demi deserves a partner who will help her continue to live a clean life and her family and friends feel she is choosing more appropriate friends.''

Meanwhile, it was recently reported that the 'Sorry Not Sorry' hitmaker intends on staying in rehab for the rest of 2018.

An insider said at the time: ''Demi is taking her sobriety extremely serious, and knows she has a long road ahead of her. At the end of the day, Demi is doing this for herself. She has to stay sober for her, but every time she has family or friends visit her it reminds her of all the other important people in her life that she needs to fight for as well.''