Sarah Jessica Parker has reportedly upset her 'Sex and the City: The Movie' co-stars after being offered the best dresses to wear to the film's premiere.

Parker has been contacted by some of the world's biggest designers to step out in one of their outfits on the red carpet next month - much to the annoyance of Kim Cattrall, Kristin Davis and Cynthia Nixon.

The trio are now allegedly refusing to arrive in the same white limousine as Parker as they don't want her getting all the attention at the New York bash.

A source told Britain's Daily Mirror newspaper: "There is huge rivalry about who is wearing what and the film's stylist Patricia Field is stuck in the middle. They are determined not to be outdone by each other."

"They are now demanding their own individual cars so each star can have five minutes on the carpet with all eyes on them - rather than SJP getting all the attention. It's turning into a logistical nightmare."

In an effort to look her best on the red carpet, Parker - who plays the movie's lead character Carrie Bradshaw - has embarked on a strict diet.

The source added: "She has been working out furiously and is on a special berry diet to look her best for the big night."

'Sex and the City: The Movie' - a big screen version of the hit TV show - opens worldwide at the end of May.