After Cate accepts the position of school nurse from Principal Gibb (Adam Arkin, ""Chicago Hope""), Bridget and Kerry are convinced that she only took the job to spy on them -- while Rory is ecstatic that his mom might be able to protect him from a school bully. Meanwhile, after Bridget inadvertently spills the beans about Kerry losing her virginity in Europe, a shocked Cate accidentally switches on the school's P.A. system and lets the whole student body in on their ensuing conversation.