Joan Rivers on Dancing? "They Can Go F--k Themselves!"

Who wouldn't want to see our favorite Fashion Police funnylady waltzing for the mirrorball trophy?

Joan Rivers would love to compete on Dancing With the Stars.

But there's a problem…

Hard to believe, but the 77-year-old funny lady tells me ABC has yet to invite her. "They've never asked me, so they can go f--k themselves!" she cracked. "I don't know why because I certainly fall into their old lady category."

E!'s Fashion Police host admits she has no rhythm. But no matter.

"I would do it for the exercise," she said. "Making yourself dance everyday for six hours a day I think would be so great."

Fellow comic Kathy Griffin says producers have come after her several times. "I won't do it," she said. "I'd lose too much money because I wouldn't be able to tour as much."