Joan Rivers’ Doctor Mugs for Camera in Celine Dion Movie (VIDEO)

EXCLUSIVE

The doctor who was performing a procedure on Joan Rivers when she stopped breathing allowed cameras into her office for a Celine Dion documentary … performing a vocal cord procedure and joking around with the well-known singer.

Dr. Gwen Korovin tartan out Celine’s strained vocal cords for the singer’s 2010 documentary, “Through the Eyes of the World.”  

The procedure is called a laryngoscopy … in which the mouth/oral cavity is numbed so the patient can respond to the doctor’s commands.

Check out the photos of her well-known patients lining the walls … patients that include Lady Gaga, Hugh Jackman, John Mayer and Brooke Shields.  

Korovin was not certified to perform medical services on Joan during her endoscopy. She was reportedly performing a biopsy when Joan stopped breathing and CNN is reported the doctor took a selfie while Joan was under.