Update: Zsa Zsa Gabor in Surgery; 50/50 Chance of Surviving

Zsa Zsa Gabor is currently in surgery. Read on for details.

The 93-year-old Hollywood icon is undergoing a hip replacement surgery, which is expected to take four hours. Her devoted husband Prince Frederic Von Anhalt tells ET that doctors told him Gabor has a 50/50 chance of surviving the surgery, although her vital signs were stable going into the procedure.

Gabor was watching "Jeopardy" in her Bel Air, Calif. home on Saturday when she reached to answer the phone and fell out of bed, said publicist John Blanchette. An ambulance was called by Gabor's husband, who says he heard his wife scream after she fell.