AceShowbiz -

There hasn't been an official update on Joan Rivers' condition, but TMZ reports that the "Fashion Police" host is on life support. The 81-year-old comedienne relies on the machines to stay alive after going into cardiac arrest during a throat surgery in New York City.

Joan was rushed to the Mount Sinai Hospital Thursday, August 28. Doctors put her in a medically induced coma as they attempted to assess the damage. On Friday, daughter Melissa Rivers said Joan's condition "remains serious but she is receiving the best treatment and care possible."

Joan's 13-year-old grandson, Cooper, and Melissa's ex-husband, John Endicot, were seen leaving the hospital Saturday morning. Her family remains "hopeful" that she could fight through it and recover. Love, prayers, and get-well wishes were pouring in from friends and colleagues.

"Fashion Police" co-host Giuliana Rancic tweeted, "Praying for @Joan_Rivers and @MelRivers. Even though Joan's the strongest woman I know, every single prayer counts. I love you, Joan." Fellow host Kelly Osbourne posted, "4 the first time in years I got down on my knees & prayed tonight! I encourage U 2 do the same 4 @Joan_Rivers my grandma! #inconsolable."