Continuity mistake: When Gracie Hart is trying to tell Eric Matthews that she thinks she's cracked the ransom note's cryptic message, ("It's the Miss United States Pageant") you see a corsage hanging from her blazer. The appearance of the corsage is never explained and it disappears as quickly as it is shown. If you watch the movie's deleted scenes, you'll see that she attends her father's wedding ceremony, which was edited out of the final cut of the film. She wears a corsage in this scene.
Picture added by Hamster