Lindsay Lohan just demanded security officers at her apartment building remove her father, Michael Lohan ... TMZ has learned.
Sources close to Lindsay tell us Michael showed up -- unannounced -- in the lobby of Lindsay's apartment building moments ago. When security called Lilo -- who's only back in L.A. for the day -- she told them to send Michael packing.
We're told Michael left without a fuss, but the damage is done -- Lilo is upset Dad showed up on her doorstep.
Someone in Michael's camp claims he was just trying to bring her some Chinese food for dinner.
So much for that warm fuzzy reunion.