Is it OK to talk smack about your ex?

Anne Heche went on "The Late Show with David Letterman" to promote her new show, HBO's "Hung," but you never would have known it. She spent the majority of her interview time explaining how much she hates marriage and putting down her ex-husband, Coley Laffoon.

"Can you say 'lazy ass' on TV?" said Heche. Letterman enquired what Laffoon does for a living and Heche said, "He goes out to the mailbox and he opens up the little mailbox door and goes, 'Oh! I got a check from Anne! Oh! I got a check from Anne! Yay!'" What she failed to mention is that the checks are monthly child support payments for their 7-year-old son. Heche also mocked her ex for his new career as a soccer coach.

"He wants me to come and watch him run around in his little white shorts playing soccer," she told Letterman. "Honestly, I don't want to come to rehearsal and watch you run around in your tight shorts like trying to pretend you know how to play soccer. I divorced you! I don't want to hang around with you Thursdays and Saturdays and maybe on Sunday."

Does Heche not realize how publicly trashing her ex--the father of their child--makes her look? She now lives with her boyfriend, former "Men in Trees" costar James Tupper, and their baby boy. We wonder if Tupper is alright with Heche dissing her ex on national television. If she's so comfortable saying hateful things about the man she loved and was married to for five years, what's to stop her from doing the same to her current partner if things fell apart?

Do you think it's OK to talk smack about your ex, or do you make it a rule to keep quiet?