The 26-year-old singer has been dealing with complications stemming from her recent kidney transplant.
The metal legend was expected to remain in the hospital for a few days.
The 25-year-old singer was transported from her Hollywood Hills home just before noon Tuesday.
The father of The Jackson 5 is said to be on his death bed.
Barker’s now fighting off “thrombophlebitis in his bilateral and upper extremities as well as cellulitis.”
Ferrell and three other people suffered non-life-threatening injuries when their SUV was struck in Orange County on Thursday night.
The 70-year-old actor is said to be recovering in stable condition.
Initial reports suggested Ross was suffering from pneumonia, but another source told TMZ that the medical issue is heart related.
Dead and Company have postponed three upcoming concerts.
“It’s just a matter of time” for the convicted mass murderer, according to TMZ.
The singer’s struggles with fibromyalgia will be chronicled in her forthcoming Netflix documentary.
The rapper was found unconscious in his Chicago hotel room on Sunday afternoon.