Stefania Owen, who plays Dorrit, Carrie Bradshaw’s kid sister, in “The Carrie Diaries,” the “Sex and the City” prequel, had her bike stolen on Prince St. sometime around 1 p.m. on Wed., March 13. She and her dad, left, cable-locked their four-month-old six-speeds to a tree near MacDougal St., then went to help someone move in to their place. When they returned an hour and a half later, the bikes were gone and only 2 feet of cable was left. “The store insisted we buy this cable, that you couldn’t cut it,” her dad said. “We rode everywhere, even in the winter. It’s a great way to see the city,” Stefania said wistfully, before they headed to the First Precinct to report the theft.