Joan Rivers is a big fan of her daughter Melissa River’s porn industry kingpin boyfriend, Vivid honcho Steve Hirsch, and she told RadarOnline.com exclusively why.

“I think it’s wonderful because I know more about the porn business now,” Joan explained. “I could tell you who buys, what it’s about, what’s the latest technology, and every friend of mine is getting a tickler for Christmas.  Whether they want it or not.”

Melissa Rivers had a nasty breakup with her boyfriend Jason Zimmerman last September, and in this exclusive sneak peek of her new reality show obtained by RadarOnline.com, he screams and swears at her in a vicious fight.

In the upcoming episode of Joan and Melissa: Joan Knows Best, Melissa and Jason begin an argument after he misses a family photo shoot scheduled by her mother Joan Rivers, and Melissa is furious.