Just Like Heaven (2005)

David rents an apartment in San Francisco and much to his surprise he finds Elizabeth, a doctor who claims that it is her home. When she disappears, David tries to avoid her presence by changing the locks, but that doesn't stop Elizabeth from invading his privacy all over again. Their dispute takes a supernatural twist when Elizabeth realizes that she is stuck in a limbo between life and death. A sweet romantic comedy driven by the chemistry and charisma delivered by Reese Witherspoon and Mark Ruffalo.