Jessica Simpson Is Pissed That Nick Lachey Made a Butt-Grabbing Joke About Her Dad

Jessica Simpson, who hasn't spoken to her ex-husband Nick Lachey in six years, is reportedly furious that Lachey went on Bravo's 'Watch What Happens Live' and told anyone with cable that Joe Simpson used to grab his ass at family functions.

See, it's funny because it totally might be true.

Claimed a well-placed (and possibly well-paid) source close to the drama llama, "Jessica was shocked and horrified that Nick said what he said. She’s upset. Nick might have thought it was funny and he got a cheap laugh, but to Jessica, it wasn’t — at all."

Lachey also made comments on the program about his lack of involvement in Simpson's life since their divorce, which didn't rub the two-time mom-to-be the right way either.

"Jessica was disappointed that he would even speak about her at all.  It’s been eight years since they were married and six years since they last spoke," the tattletale said. "Jessica doesn’t feel that Nick has a right to speak about her business anymore. Jessica was mortified."

Which begs the question -- which one of her friends was watching 98 Degrees plug their new album on Bravo to catch all this in the first place?