5:40 PM PT -- Jack Osbourne has provided an encouraging update on the status of his mom's health, saying she's been released from the hospital and is now back home after getting the all-clear.
He also says she was with him filming a new episode of "Night of Terror," going on to thank everyone who sent their well-wishes and prayers. JO also says he's going to let Sharon share what exactly happened to her in her own time and on her own terms.
Sharon Osbourne suffered a terrifying medical emergency while shooting a TV show in California ... TMZ has learned.
Sources with direct knowledge tell us it all went down Friday night ... Sharon fell ill on the set of the unnamed show at the Glen Tavern Inn in Santa Paula, California. It was not clear if the cameras were rolling. The hotel was once featured on an episode of the Travel Channel's "Ghost Adventurers."
A rep for the Ventura County Fire Department tells TMZ ... EMS workers responded to a "medical call" at Tavern around 6:30 PM Friday and transported one patient to Santa Paula Hospital. Santa Paula Police Chief Don Aguilar confirmed Sharon was the patient.
We reached out to Glen Tavern and a manager said there was an "emergency," but he declined to provide details. We do not know Sharon's current condition.