Comedian Joan Rivers is reportedly on life support after suffering a heart attack during throat surgery.
TMZ, citing "sources", said Rivers' family would decide in the coming days whether to keep the 81-year-old on life support.
Rivers has been in a medically-induced coma since Thursday, local time, when she stopped breathing while undergoing surgery on her vocal cords.
"Her condition remains serious, but she is receiving the best treatment and care possible," her daughter Melissa said in a statement released by the hospital.
"My mother would be so touched by the tributes and prayers that we have received from around the world," she added.
Meanwhile, comedian and TV roast master Jeff Ross made light of his friend's health crisis, joking, "Don't worry folks, @Joan_Rivers won't die because she refuses to follow Robin Williams. Get well mama. We need you."
The comedienne is known for her cutting remarks and has often come under fire for her scathing comments about fellow celebrities.
In the past, she has branded Kim Kardashian and Kanye West's daughter North "ugly" and Hollywood actress Jennifer Lawrence "arrogant".
However, fellow fashion police co-host Giuliana Rancic, 40, has spoken out about the star's softer side.
"Joan is incredible. When I went through my breast cancer, I cannot even tell you guys how nurturing she was, how loving she was," she told E! News.
Like Ross, many other A-listers have been taking to Twitter to express their hopes and love for Rivers.
"Sending love and prayers to Joan Rivers tonight. Xxxxx (sic)," Cyndi Lauper wrote.
Courtney Love posted: "Hang in there @Joan_Rivers So many awful gowns are going to be worn this year as bait for you pull through. Love and prayers Court (sic)"
-with Cover Media