Do not ask Sarah Jessica Parker about 'Sex.' Seriously.

During this morning's video interview sessions at the Sundance Film Festival with the cast of "Smart People" -- Dennis Quaid, Thomas Haden Church and Sarah Jessica Parker -- all reporters were firmly warned NOT to ask any questions about  "Sex and the City: The Movie."

Or else.

Even so, a Canadian TV reporter deftly snuck in a mention of all the great actors Carrie Bradshaw, sorry, Sarah, has worked with including "Dennis and ... Chris."

"Chris?" asked Sarah, clearly thrown.

"Did you see that? Did you see how she snuck in the name of Chris Noth?" a faux-outraged THC demanded.

The reporter then tried to get Carrie, sorry, Jessica, to comment on Mr. Big's, sorry, Chris' new baby and if she'd spoken to him since the baby was born. "You mean Mr. Big's Little?," THC asked.

But no dice. Seems there was an official embargo on all "Sex and the City"-related discussion. Because you know how these TV people are. They''ll do the whole darn interview about "Smart People" and then edit it and air the one sentence about "Sex and the City: The Movie." They cannot be trusted, these TV people.

Anyway, after much laughter and a few minutes discussion on another "People"-related subject, THC again exploded with ... "Mr. Big!" Shushed to silence by a now hysterically laughing, almost crying SJP, THC shouted, "Damn this 'Sex and the City' embargo!"

So when the trio of "Smart" actors sat down next to talk to The Envelope, I told them flat out that there would be no discussion of "Sex and the City" permitted and that I only wanted to discuss "Smart People."

Got that? And I mean it!

And yeah, they all laughed.

Check back tomorrow on The Envelope to see the videos with director Noam Murro and writer Mark Poirier, the duo who will collaborate on a film based on another of Poirier's darkly amusing dysfunctional-family novels, "Modern Ranch Living."

Sarah, Dennis and Thomas will also discuss the film, the standing ovation it got at Sunday's premiere, their roles, all those bare-buttocks scenes that Thomas insisted on and about working with that impossibly difficult and untalented diva, Ellen Page, before she shot "Juno" and became Hollywood's "it" girl.

THC  bellowed, "We're like the engine of the Ellen Page train!"

But they will not, I repeat not, discuss "Sex and the City: The Movie." I made them promise.

Photo credits: WireImage