Lindsay Lohan admitted via Twitter that she failed her most recent court-ordered drug test.

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"Regrettably, I did in fact fail my most recent drug test and if I am asked, I am prepared to appear before judge Fox next week as a result," Lohan said Friday on her Twitter page.

"I am so thankful for the support of my fans, loved ones and immediate family, who understand that i am trying hard, but also that I am a work in progress, just as anyone else. I am keeping my faith, and I am hopeful....Thank you all!!!"

The 24-year-old actress initially denied a report from gossip Web site TMZ.com indicating she failed the drug test, telling US magazine, "They're all nuts."

Lohan spent 23 days in rehab treatment at the UCLA Medical Center last month after serving 13 days of a 90-day sentence for probation violation.

Beverly Hills Judge Elden Fox ordered Lohan to undergo weekly therapy sessions and submit to mandatory drug tests, warning her she could go back to jail for 30 days if she was found to violate those terms.