Joan Rivers

London - Joan Rivers was in "good spirits" the night before she was rushed to hospital following cardiac arrest.

The 81-year-old comedienne appeared "absolutely fine" as she attended a meal at the Amaranth Restaurant in New York, before cracking a joke about death during a performance at Laurie Beechman Theatre on Wednesday night.

An audience member told the New York Daily News newspaper that Joan had said: "I'm 81 - I could go at any moment. I could fall over right here and you all could say, 'I was there!' "

The fan added: "If you had me guess her age, I'd say she was in her 50s.

"She didn't miss a step, she didn't go ditzy, she didn't forget anything and her timing was amazing."

Another source said: "She was so lively and sweet. She even let people take photos with her. She definitely had a lot of energy! She was cracking jokes about everyone from Jay Leno to Jackie O. She was as sharp as she's ever been."

In a statement obtained by E! News, Joan’s daughter Melissa said: "I want to thank everyone for the overwhelming love and support for my mother. She is resting comfortably and is with our family. We ask that you continue to keep her in your thoughts and prayers."

The 'Fashion Police' host was rushed to Mount Sinai Hospital in New York on Thursday after she stopped breathing during an operation on her vocal cords at the Yorkville Endoscopy earlier in the day.

The blonde beauty was said to be in a critical but stable condition after doctors managed to restart her heart following a reported

cardiac arrest.

A hospital representative, Sid Dinsay, said in a statement: "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."- BANG Showbiz