Actress Lindsay Lohan says she has been attending Alcoholics Anonymous meetings for the past year.
Lohan has starred in Mean Girls and Herbie Fully Loaded
"I feel better not drinking," the star, 20, told People magazine, adding she had not had a drink in seven days.
Asked why she had not talked about it before, she replied: "It's no-one's business. That's why it's anonymous!"
The New York Post reported sightings of Lohan at an AA meeting in November and her mother, Dina, later confirmed the Herbie star was attending meetings.
"I haven't had a drink in seven days," said Lohan, who is under the legal drinking age in the US.
"I don't drink when I go to clubs. I drink with my friends at home, but there's no need to."
Lohan's frequent partying and drunken exits from night clubs have been a fixture of tabloid newspapers in recent months.
In July, Morgan Creek Productions chief executive James G Robinson sent a letter to the actress rebuking her for arriving late on set for the film Georgia Rule, suggesting "heavy partying" was to blame.
"You have acted like a spoiled child, alienated many of your co-workers and endangered the quality of this picture," he was quoted as saying in the letter.
The actress now admits that she became worried by her portrayal in the press.
"I was like, 'I don't want to be written about at these clubs with these people'," she told People.
"I work, I act, I have a living. That's what I do every day. I work every single day."
Lohan has most recently been seen in Bobby, which centres on the assassination of Senator Robert Kennedy in Los Angeles in June 1968.
Her previous films include Freaky Friday, Mean Girls and The Parent Trap.