NEW YORK — “South Park” co-scribe Pam Brady has sold an untitled romantic comedy pitch to Warner Bros. for mid-six figures.Pitch is about a couple in love that plans the perfect romantic weekend, but after an apocalyptic breakup, the man takes another woman and the woman takes another man to the getaway spot and problems ensue. Brady, who co-wrote WB’s “South Park: Bigger, Longer and Uncut” with Trey Parker and Matt Stone, last year signed a three-year development deal with Touchstone Television. Deal, worth $6 million, kicked in last month. Brady was also one of the TV scribes, along with Larry David (“Seinfeld”), Glen Morgan and Jim Wong (“The X-Files”) and Matt Selman (“The Simpsons”), who inked with Icebox.com in March to provide content for the recently launched animation Web site. Brady served as a producer and co-writer of NBC’s “Just Shoot Me” and was previously a production exec at Fox when she left to become a consultant-writer on “South Park.” She is repped by UTA.