Lindsay Lohan -- Parlez-Vous Party Time?

Lindsay Lohan should've spent the last few nights trying to get her ass back to the U.S. -- here's what she was doing instead ...

TMZ obtained several photos showing LiLo fully immersing herself in the French party scene within the last few nights.

Hope she had a good time, 'cause she's gonna be paying for it -- courtesy of one tough Beverly Hills judge.