Lindsay Lohan -- The Brazilian Party Train Rolls On

Lindsay Lohan remained upright as she made her way into a nightclub in Sao Paulo last night ... continuing her partying ways before she heads to rehab.

Lindsay's nightclub foray didn't go so well -- she was photographed sitting underneath a table and crying. All this while she has a 90-day lockdown rehab sentence hanging over her head, as well as new allegations she walked off with jewelry from the "Anger Management" set without permission.