Joan and Melissa Rivers stopped by to promote the new season of "Joan Knows Best," but Howard was more interested in Melissa's porn kingpin boyfriend, Vivid CEO Steven Hirsch. Melissa said Steven kept his business separate from his personal life ("He's very normal."), but their relationship has generated several sex tape offers from rival porn companies: "I don't want it." Howard noted that Joan often stays with Melissa when she's in LA--Joan doesn't keep a place of her own in California--and asked if her visits were ever a burden. Melissa laughed: "Uh, can I have a sip of coffee? No, she's not a burden...maybe a little burden." How little depends on the length of Joan's stay: "Two days a week it would ideal. Four it gets to be a little close quarters."