Joan Rivers and Chelsea Handler are in a major feud that's no joke! Joan and her daughter, Melissa, (appeared on Howard Stern's radio show where she) slammed the E! host and her past relationship with the president of E! Network.

Joan said:

"The girl made it on her back f**king the president … of the network. She's ordinary. She's not a genius."

The day before her rant, Chelsea went on Howard's show and said, "Joan Rivers? What the f**k do I care about Joan Rivers? I don't think about her ever."

Joan claims that the feud began at a network event where Chelsea ignored her and was outrightly rude, but Chelsea claims that Joan started it.