Warning! This is not meant to be taken seriously! I can write better, but this way adds to the humor. Please don't be afraid to request a serious one shot, I can do better.
One day Bluestar was recovering from her mental breakdown when she had an idea: "I know what will make me feel better! I will become a superstar!" So she went and bought a dress and became popular by singing her hit song: "Lead When You're Sad, No Matter How Bad You are at It". Then one day at her hit single concert she got abducted by aliens! They told her that she was too self centered so they will make her a literal star, so that she'd get no recognition for doing stuff. But the procedure malfunctioned so she became blue. Nobody listened to her anymore because since dead cats appeared as stars in silverpelt they thought she was dead or something. Moral of the story is, if you're sad don't lead, instead leave and become a kittypet. That worked for Pinestar, anyway!