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Speaking to AP, a representative for the studio revealed that all four main cast members - Sarah Jessica Parker, Kim Cattrall, Kristin Davis and Cynthia Nixon - had signed new contracts.
The announcement ends months of speculation about a possible follow up, after the original movie exceeded expectations by grossing over £280 million worldwide.
In a statement, writer/director Michael King said: "I'm very excited to work with these amazing actresses again and would love to give everyone more information about the sequel ... but I'm busy with my Sex life."
Filming is expected to begin this summer with a scheduled 2010 release date.
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