Lindsay Lohan Hits NYC Bar Scene … 4 Days Before Rehab

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With less than a week to go until her court-ordered stint in rehab, Lindsay Lohan hit the NYC bar scene Monday night … AND ACTUALLY BEHAVED HERSELF!!!

our sources has learned … Lohan spent her Monday evening at The Bitter End — the piano bar credited with giving Lady Gaga her start back in the day.

Sources at the bar tell us … Lohan rolled in to the place with 9 or 10 friends to watch some of her pals perform at a “Jam Fest” event.

We”re told Lindsay sat quietly at her table for roughly 3 hours and didn”t suck down one drop of alcohol — just soda.

One source inside the bar tells us Lohan was so “very well behaved” … people in the joint barely even noticed the actress.

As for Lindsay, she”s expected to enter a treatment center in the Hamptons on May 2 — where she”s supposed to complete a 90-day program.