Lindsay Lohan -- Reunites With Ex-Assistant Who Ratted Her Out to Cops

Lindsay Lohan appears to have made-up with an old friend ... only problem, it's another crony with whom she has a history of getting into trouble.

LiLo was spotted leaving Lure restaurant in NYC last night with Gavin Doyle -- the same guy who ratted her out to cops last year ... when he told them Lohan was the driver in their crash on PCH -- a fact Lindsay tried to conceal.

Lindsay also famously booted Gavin from her car last year ... after leaving an NYC jail for allegedly punching a "gypsy." He was also her employee during most of Lohan's darkest drug fueled days.

It's unclear when the two made up -- but we thought for sure he would have been one of the 80 "toxic friends" LiLo cut from her life after rehab.