Superstar (Stella Batts) by Courtney Sheinmel,Jennifer A. Bell details from sapnaonline

Meet Stella Batts. She's in third grade, she wants to be a writer, and her parents own a wonderful candy shop. Life should be good, right? And now she's back and ready to start writing her eighth book about her favorite subject--her life! In Superstar, Stella gets the chance to audition for her favorite television show, Superstar Sam, after a casting director spots Stella out for dinner with her family. He said she is perfect for the role. Stella rehearses her lines until she knows the part by heart. Her little sister, Penny, is jealous but sometimes older sisters get to do things little sisters can't. But the audition doesn't go as planned. Stella was sure she had the part. Now will she ever get a chance to show her acting skills and meet her favorite actress?