Psychic Shayne Goldfarb led the séance at Pol Atteu's Beverly Hills boutique, according to Atteau's partner, close Smith friend Patrik Simpson.
Among those attending was Smith's neighbor and psychiatrist, Dr. Khristine Eroshevich, who traveled with Smith in her final months and who, along with two others, will soon stand trial on drug conspiracy charges.
Simpson, co-author of Anna Nicole Smith, Portrait of an Icon, Signature Edition, says he's convinced they really did contact Smith during the séance and that the psychic told them Smith is "happy she's with (her late son) Daniel. She's sad she had to leave her daughter, but she really had to be with Daniel."
It was on Feb. 8, 2007, that Smith died at the Seminole Hard Rock Casino in Hollywood, Fla., at age 39, after her body was assaulted with prescription medications that left her too weak to move. Smith made it clear to those around her that she was depressed and heartbroken after Daniel died at age 20 just months earlier while visiting his mother in the Bahamas upon the birth of his baby sister, Dannielynn, who was fathered by photographer Larry Birkhead.
"We just returned from the Bahamas and visited the grave site and Dannielynn bent down and kissed the pictures of her mom and Daniel," Birkhead tells PEOPLE exclusively. "There are days when I can laugh about old memories and there are times when the memories are too much. It still seems like she was here just yesterday. I can't believe it has been three years."
He adds that Dannielynn often talks about Anna and Daniel. "Last month, we were traveling on a plane and Dannielynn smiled and looked out the window and said, 'My mommy is in those clouds in heaven,' " Birkhead says. "Dannielynn also points out pictures in a room to visitors at the house and tells anyone who will listen, 'That is my mommy and Daniel.' "
Los Angeles Superior Court Judge David Wesley has scheduled a trial date for Aug. 4 for Eroshevich, 62, Howard K. Stern, 41, who was Smith's lawyer and fiancé, and Dr. Sandeep Kapoor, 41, Smith's physician. The next hearing is set for April 23.
Stern is charged with 11 felony counts, including obtaining a prescription by deceit; fraud and conspiracy. Eroshevich and Kapoor each face six felony counts. All three have pleaded not guilty.
Witnesses are expected to include a pharmacist who has testified in preliminary proceedings that he refused to fill a prescription written by Eroshevich because the high doses of medication amounted to "pharmaceutical suicide."