Bridget came on "TMZ Live" this Halloween, breaking down her séance at Holly's house -- which she claims is haunted -- and telling us about the girls' paranormal chat with the late Playboy founder.
As we first told you ... the former 'Girls Next Door' stars planned to contact Hef the night before Halloween with the help of "Ghost Adventures" star and Hollywood psychic medium Patti Negri.
The girls accomplished their metaphysical mission, contacting Hef and several other spirits from beyond the grave.
Holly and Hugh had a rocky history before his death -- she claimed he abused her emotionally and verbally while she was in the Playboy Mansion -- but Bridget says Holly was totally okay with getting in touch with Hef's spirit.
It's kinda spooky ... Bridget says during the séance, Holly learned Hef periodically checks in on her from the spirit world, but Holly's happy to know he still cares about her.
Bridget says nothing crazy happened during the ritual -- no chandeliers jingling or curtains billowing in the wind -- but she's got a few ghost stories from Holly's house that will make your skin crawl!!!