Kim Cattrall is wrecking havoc on the New York City set of ‘Sex And The City: The Movie.’

“Km is an absolute horror,” an NYC source tells The National Enquirer.

“Right now ‘Sex and the City’ should be renamed ‘War and the City.’ It’s turned into a battleground of runaway egos!”

“She’s always resented Sarah for having a producing credit, and she came into the project bitter after holding out for more money.”

“In the end, Kim decided to reprise her role because she needs the work and the money. But she’s miserable-and she’s taking it out on everyone!”

(Now here’s where it gets weird.)

“Now Kim insists that everyone refer to her as Samantha….instead of addressing her by her real name.”

“And she doesn’t talk to Kristen because she thinks Kristen is Sarah’s spy. Cynthia doesn’t want to get involved in the cattiness, so if she isn’t filmings, she’s locked in her trailer.”

Sarah Jessica Parker has stepped into the role of ‘peacemaker’ in an effort to keep production rolling on the motion picture, set for a Memorial Day Weekend 2008 opening.

“….Poor Sarah arrives on set before dawn and often doesn’t leave until 10 or 11pm. She’s lost weight and sneaks catnaps in between takes.”