Did you ever wonder what Carrie Bradshaw was like in high school? Who was the first boy — or girl? — she had sex with. Wonder no more. “Sex and the City” author Candace Bushnell is writing a pair of teen novels, “The Carrie Diaries,” that “takes readers back to Carrie Bradshaw’s formative years in high school, giving an inside look at Carrie’s friendships, romances and how she realized her dream of becoming a writer,” HarperCollins announced this week. The first book will come out in 2010.