AceShowbiz - Lindsay Lohan's father is convinced his daughter has emerged from rehab a "changed" woman, insisting the actress is back "at her best". The "Mean Girls" star endured a troubled 2010, which saw her in and out of jail and rehab, before she was ordered to complete a three-month treatment program for breaching her probation stemming from a 2007 DUI arrest.

She completed her court-ordered stay earlier this month and Michael Lohan reveals she has been keeping her addictions at bay by attending Alcoholics Anonymous (AA) meetings. And he's convinced the actress has successfully turned her life around.

He tells Hollyscoop.com, "We went to an AA meeting last night then went home and had a quiet night. She changed back to the girl she used to be. When she was at her best - literally. She's done a 180 and I'm very proud of her."

He also told Radar Online that Lindsay has passed all the drugs test. "Lindsay is doing four or five tests a week and she has passed all of them with flying colors," Michael said. "She's doing really great right now. She is serious about staying healthy and is avoiding all the old things she used to do."