A silent movie star meets a young dancer, but the arrival of talking pictures sends their careers in opposite directions.

Outside a movie premiere, enthusiastic fan Peppy Miller literally bumps into the swashbuckling hero of the silent film, George Valentin. The star reacts graciously and Peppy plants a kiss on his cheek as they are surrounded by photographers.

The headlines demand: "Who's That Girl?" and Peppy is inspired to audition for a dancing bit-part at the studio. However as Peppy slowly rises through the industry, the introduction of talking-pictures turns Valentin's world upside-down.