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…