Sources say that two of the show's stars, Kim Cattrall and Sarah Jessica Parker are continuing their years-long feud on the set of the show's long-awaited movie.

When SATC left the air in 2004, it looked as though a movie version wouldn't be far behind. Plans for the movie, however, stalled amidst rumors that Cattrall was holding out for equal pay to Parker - the show's leading lady and an executive producer. But things got back on track in 2007 and it seemed as though Cattrall and Parker had left their differences - which predated Cattrall's salary issues - behind.

Unfortunately, the ladies can't seem to let bygones be bygones. Last week, Cattrall pulled a diva move, leaving a reunion party at Butter in NYC. The Daily Mail quotes one insider: "Kim and Sarah had words and obviously something was said that upset Kim and she just stormed out. It's well known the girls are all quite feisty and opinionated. Everyone else at the party seemed quite embarrassed and shocked."

The nastiness continued during a shoot later on. Said a source, "Kim wanted to wear a pair of red heels and picked them out from wardrobe especially, but then Sarah apparently swept in and took them, much to Kim's disgust." According to the Mail, things got so ugly that Kristin Davis had to separate the two actresses.

Don't expect Sarah and Kim's problems to keep the movie from getting finished. Says the source, "By the end of the TV series they could barely be civil to each other. But both women are top professionals and won't let this get in the way of their jobs. They know the Sex And The City movie is a huge money-spinner and a great way to wave goodbye to their characters, and each other, for good."