Lindsay Lohan says her wild days are behind her.

The 'Mean Gilrs' actress is due to complete her 90-day of court-ordered rehabilitation on July 31 - which is part of a plea deal she struck to avoid jail after lying to police officers about driving in a car accident last year - and has told friends she is changing her ways.

A source told the US issue of OK! magazine: ''She's 100 per cent determined to never go to rehab or get arrested again. She's serious this time and she's finally taking direction. She gets up at 7am, she's never late to the group meetings and she's the first one in the van when they go to AA meetings.

''She's still smoking but the techs tell patients not to try quit two addictions at once. She has also been told to stay away from dating for a year and she's up for it.''

The 26-year-old star transferred to the Cliffside rehab facility in Malibu, California, earlier this month after checking out of the Betty Ford Clinic.

Lindsay's father Michael Lohan recently claimed the new location was ''better'' for his daughter.

He said: ''Cliffside is better for her than Bett. She has more freedom, it's more personalised, and the treatment is better for her.''