London, Sep 18 (IANS): Troubled actress Lindsay Lohan is reportedly facing a 30-day jail sentence after failing in her latest drug test ordered by the court.

The "Mean Girls" star is trying to rebuild her reputation after serving time behind bars and in rehab following a probation violation issue earlier this year, stemming from her 2007 driving under influence (DUI) arrest.

But the 24-year-old, who was treated by addiction specialists for her prescription drug use, could find herself incarcerated once more after a drug test taken "in recent days" came back positive, reports contactmusic.com.

According to a source, the drug in question was cocaine and if the claims are true, she will face 30 days in jail.

"People with addiction problems don't get better magically, and she's really been making an effort to make herself better," said an insider.

However, Lohan will have to wait to hear the final verdict. Sandi Gibbons, a spokeswoman for the Los Angeles district attorney's office, who is handling her case, has yet to be "officially notified" of the test results.

Lohan is currently undergoing intense outpatient treatment following her release from rehab last month. As part of her punishment, the embattled star is subjected to random drug testing twice a week.

However, the actress' representative is yet to respond to the failed drug test reports.