Credit: Dimitrios Kambouris/WireImage

Here we go again?

Lindsay Lohan may be going from house arrest to the Big House. TMZ reports that the troubled star, who turns 25 next week, recently tested positive for alcohol and must appear before a judge in an L.A. County Superior Court Thursday morning.

The former Disney actress was sentenced last month to four months in jail after she pleaded no contest in the theft of a $2,500 necklace in April; due to prison overcrowding and because she is a nonviolent offender, she's been serving the time via house arrest.

Lohan's alleged positive alcohol test means she violated her probation terms -- and L.A.'s probation department plans to ask Judge Stephan Sautner to throw her into LA County Jail.

Also at issue? Lohan has been photographed having parties with pals at her home during the house arrest.