An arrest warrant has been issued for actress Lindsay Lohan. According to TMZ.com, authorities have revoked the actress' probation following reports of her two failed drug tests. A report detailing the drug tests, which were part of the terms of her probation, was filed in a Los Angeles Court on Monday. The bench warrant for Lohan's arrest is currently on hold until Friday morning at 8:30 a.m. Lohan is also expected to appear in court at that time. The actress admitted on her Twitter feed over the weekend that she was dealing with her substance abuse and ready to face the consequences of her failed drug tests. She commented that she was prepared to go before Judge Elden Fox this week.Lohan was recently released from a court-ordered rehab program and, before that, a two-week stint in jail as ordered by a judge earlier this year. The judge handed down the sentence after finding Lohan in violation of her probation related to a pair of DUI convictions from 2007.