Cinderella
(1950)

The friendly animals free Cinderella from her room after her suspicious stepmother locks her in, having realized she is the girl who will fit the glass slipper. She comes downstairs just before the Duke and his footman leave; the stepmother trips the footman before he can present the shoe to her, and it shatters. But Cinderella had the other one all along, so the happy ending ensues."

Thanks Rori!