David Letterman walks out on Joan Rivers interview

Comedian Joan Rivers shares a laugh with Dave when she visits the Late Show with David Letterman Tuesday Feb. 26, 2013 on the CBS Television Network. (Jeffrey R. Staab/CBS)

Joan Rivers continues her book tour. 

Three days after walking out on CNN after objecting to Fredricka Whitfield’s line of questioning, Joan stopped by David Letterman‘s CBS late-night show tonight. 

When she began to poke fun at June Allyson — America’s Sweetheart circa 1940 — Dave walked out and his guest was left to go it alone:

[The following video contains explicit language]