Philip Seymour Hoffman's longtime partner came out of seclusion Tuesday ... to make plans for the actor's funeral.
Mimi O'Donnell went to the funeral home on New York's Upper East Side to make arrangements for Friday's service. She was accompanied by Hoffman's personal assistant.
Hoffman and O'Donnell were together 15 years and had three kids. There are unconfirmed reports the two split recently.
We're told the funeral will be small and private -- for family and close friends.