Lindsay Lohan’s week is off to a rough start.

Following a weekend full of reports — and her own admission — that she had failed court-mandated drug tests, a California judge has issued a warrant for her arrest, TMZ reports.

The bench warrant is on hold until Friday at 8:30 AM, when Lindsay is ordered to appear in court.

Lohan, 24, could be sentenced to 30 days behind bars for each of the two failed tests.

“I predict she will get at least 30-45 days for the violations,” Santa Monica-based criminal defense attorney Steve Cron told FOX411.com. “Judge Fox is going to want to ensure Lindsay is taking the court system seriously and right now, she just doesn’t seem to get it.”

Lohan tested positive for cocaine and amphetamines, TMZ reports.