The actor Andrew McCarthy is writing a diary for Slate about his work on a new television show called Lipstick Jungle. The show is not good (this isn’t what McCarthy says; it’s what I’m telling you). But it turns out that McCarthy, who remains best known for his work as a teen and post-teen heartthrob in Pretty in Pink and St. Elmo’s Fire, is a very, very good writer. This is only a little more surprising than the discovery that Mare Winningham, who was in St. Elmo’s Fire with McCarthy and appeared in approximately 248 made-for-television movies playing a teenage prostitute, converted to Judaism a few years ago and recorded an album called “Refuge Rock Sublime,” which features a bluegrass version of “Etz Chaim” and another number in which she sings: “The Torah will be a fixed point in my life.” It’s…well…it’s certainly very…interesting….