Don't put those Jimmy Choo shoes back in the closet just yet. Even as ''Sex and the City'' prepares to end its TV run on HBO this Sunday, a movie version is definitely in the works, Variety reports. Emmy-winning ''Sex'' writer-producer-director Michael Patrick King is writing a screenplay, which he's due to submit in May. By that time, HBO is expected to have coughed up the financing and to have signed deals with Sarah Jessica Parker, Kim Cattrall, Kristin Davis, and Cynthia Nixon to reprise their small-screen roles. The movie would mark King's feature directing debut. It also means the show has officially turned into the entertainment version of Carrie's on-again-off-again beau, Chris Noth's Mr. Big -- just when you think it's finally out of your life for good, it comes back to torment you by dangling before you the possibility of a future.