Lindsay Lohan has checked herself into rehab, according to a statement issued through her publicist, Leslie Sloane Zelnik.
"I have made a proactive decision to take care of my personal health. I appreciate your well wishes and ask that you please respect my privacy at this time."
Us Weekly reports that Lohan entered the posh Wonderland Center in Los Angeles at 2:30 p.m. Wednesday, arriving in a sports utility vehicle and clutching a Jamba Juice.
Just last month, the 20-year-old actress revealed that she had been attending Alcoholics Anonymous meetings for a year.
"I haven't had a drink in seven days. Or anything," she said to People. "I'm not even legal to, so why would I? I don't drink when I go to clubs. I drink with my friends at home, but there's no need to. I feel better not drinking. It's more fun. I have Red Bull."
"It's a place to go and feel safe," Zelnik said at the time. "No one judges her, and it's going to be a slow process. But, to me, the fact that she's seeing that there's something not right makes her smarter than the next person."
In December, she was seen partying with exotic dancers in New York City. The "Mean Girls" star has embarked on pole-dancing lessons to prepare for a role in the upcoming film "I Know Who Killed Me."
Last July, Lohan was treated for several hours at a Los Angeles area hospital for overheating and dehydration on the set of "Georgia Rule."
The studio producing the film accused her of "all night partying" -- which caused her to miss work and cost the studio "hundreds of thousands of dollars" in damages.
In a July 26 letter to Lohan, the CEO of Morgan Creek Productions, James G. Robinson, said Lohan was "discourteous, irresponsible and unprofessional" and acting "like a spoiled child."
Despite her reputation as a party girl, Lohan had long denied that her social life had gotten out of hand. In a November appearance on Oprah Winfrey, she asked, "Is it a crime to go dancing with your friends?"
It hasn't been an easy January for Lohan. Earlier this month, she was hospitalized for an appendectomy.
The Associated Press contributed to this report.