UPDATE: Joan is in stable but critical condition, according to E! Online.
ET can confirm that Joan Rivers was rushed to the hospital on Thursday and was in critical condition.
The DCPI (Deputy Commissioner, Public Information) tells ET a call was placed around 9:40 a.m. that an 81-year-old female patient at Yorkville Endoscopy on East 93rd street, near Third Avenue, in New York City was transported to Mount Sinai Hospital
WATCH: Joan Rivers Storms Out of CNN Interview
A spokesperson for the hospital confirms, "This morning, Joan Rivers was taken to The Mount Sinai Hospital in New York, where she is being attended to. Her family wants to thank everybody for their outpouring of love and support. We will provide an update on her condition as it becomes available."
According to reports, the comedienne was having throat surgery, a "minor endoscopic procedure," done at a New York City clinic when she stopped breathing. She was taken to Mount Sinai Hospital where her daughter Melissa and her 13-year-old son Cooper are flying out to be by her side.
After news of her condition broke, several of her friends took to Twitter to send out their positive thoughts.
Over the summer, ET was with Rivers while she was promoting her book, Diary of a Mad Diva, and caught her officiating a gay wedding. Check out the brighter moment, below, and leave your well wishes for the comedian in the comments.