Junie B. Jones is a very grown-up little lady. So how come everyone treats her like a baby? It's not fair! And Junie B. knows just how to fix the situation. Her aunt Flo is getting married. What a perfect chance for her to show everyone how grown-up she is! Too bad she wasn't picked to be the flower girl in the wedding so she could really show off. But surely Junie B. can still find some way to get everyone's attention?