Lindsay Lohan’s Probation Revoked, Bench Warrant Issued

ET has learned that Lindsay Lohan's probation has been revoked and that a bench warrant has been issued for the embattled star's arrest.

The bench warrant is being held until Friday, September 24 at 8:30 a.m., when the 24-year-old is ordered to appear in court.

Lohan announced via her Twitter page late Friday night that she had failed a drug test, tweeting in part, "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."