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After a night of partying at the Roosevelt in Hollywood, Lindsay Lohan is holding up her end of the bargain by getting drug-tested in Venice. Her probation says Lilo must remain drug free.

The 25-year-old starlet, wearing a black dress and funky shades, is trying to stay on track ... with the hopes of resurrecting her film career. With her participation in the upcoming Gotti film still up in the air, producers want to make sure she's ready for the commitment.

Over the last month, Linds has been enjoying the surf in Malibu, as well as non-stop photo shoots for various magazines.

Superior Court Judge Stephanie Sautner is keeping an eye on Lilo's progress with her probation ... stemming from previous charges including drunken driving and misdemeanor theft.