See bottom of post for update.
Halston Heritage's pleated cocktail dress retails for $435 at Singer 22 and is worn by Sarah Jessica Parker in the Sex and the City 2 movie. (Also available in black - photo from Nordstrom)
Want a simliar dress for a much lower price? Go Jane has a fantastic alternative that also comes in black, coral, and jade for $32.80. Click here if you're interested in purchasing.
*Update - 1/4/11* - Note: The original post is from May 2010, so the Go Jane version may not be available any longer. Reader Sara just sent in another great option from Nordstrom which retails for $44 and also comes in navy. Click on the photo below if you're interested in purchasing.