Joan Rivers -- Melissa's Tearful Farewell as Body Transported

It was an incredibly emotional scene this morning as Joan Rivers' body was transported to a crematorium -- and her daughter and grandson said goodbye.

Melissa Rivers watched as 6 pallbearers carried the coffin out of an upper East Side funeral home to a waiting hearse. A NY Post camera shot Melissa and her son Cooper walking to the back of the vehicle ... where Melissa kissed the coffin.