updated 02/03/2012 AT 2:20 PM ET
•originally published 02/03/2012 AT 6:10 PM ET
The resourceful and aggressive paparazzi have managed to track down her estranged husband Ashton Kutcher, her ex-husband Bruce Willis and her daughter Rumer Willis, but have yet to get that elusive shot of Moore.
Not since Tiger Woods disappeared during his marriage scandal has speculation about a troubled celebrity’s whereabouts so consumed Hollywood.
“Demi is such a private person,” a source close to her tells PEOPLE, “and where she is now is being kept top secret.”
Another source tells PEOPLE that only a “very close” group of friends knows where Moore is.
Her rep’s only statement during the health crisis said that Moore, 49, had decided to get “professional assistance to treat her exhaustion and improve her overall health.”
With no eyewitness sightings of her since, the reports and rumors have included everything from “spiritual counseling” at an unknown location to prayer sessions with Kutcher at her house.
In recent days, residents of Utah have been abuzz over suggestions she may have headed to the Cirque Lodge in Sundance, though nobody has actually reported seeing her there.