Sarah Jessica Parker and Kim Cattrall's alleged ongoing feud is threatening the future of the second 'Sex and the City' movie.

The actresses - who didn't get on when they filmed the six series of the TV show and the first movie adaptation in 2008 - are said to dislike each other so much they refuse to talk to one another, leaving the rest of the cast and crew feeling uncomfortable on set.

Sarah Jessica Parker has security worthy of a U.S. President on the set of her new movie. The 44-year-old actress began shooting "Sex and the City 2" in New York earlier this week, and has been hounded by over-enthusiastic fans keen to get a glimpse of their idol.

A source said: "The film's security team looked more like they were protecting the president than Sarah Jessica Parker."