Lindsay Lohan partied at a Hollywood cemetery last night as a sexy nurse.

Lindsay Lohan has become so comfortable around dead bodies ... that she partied at a Hollywood cemetery last night.

Lohan threw on her finest "slutty nurse" costume and hit the Hollywood Forever Cemetery ... where she attended a HUGE Halloween party with the likes of Paris Hilton and Christina Aguilera.

Whenever she wakes up this morning, Lohan is expected to return to the L.A. County Coroner's Office ... to continue cleaning up after some fresh corpses.