Los Angeles, California (CNN) -- A judge revoked Lindsay Lohan's probation Monday and the actress was ordered to appear in court Friday, a Los Angeles court spokesman said.
Lohan acknowledged through Twitter postings Friday night that she failed a recent drug test and that she was "prepared to appear before judge Fox next week as a result".
Judge Elden Fox signed a bench warrant for Lohan's arrest but is holding it until a hearing at 8:30 a.m. Friday, according to Los Angeles Superior Court spokesman Allan Parachini.
Lohan's supervised probation for a 2007 drunken driving conviction requires frequent drug tests. The judge warned her last month any failure could send her back to jail.
CNN
