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Lady Gaga's is set to appear in the upcoming movie "Sin City: A Dame To Kill For." 

The movie's star Joseph Gordon-Levitt has confirmed the news during an interview with Boston radio station JAM'N 94.5.  Gordon-Levitt said that the pop star already filmed her short cameo appearance for the comic book sequel, and that he was "really impressed" with her acting chops. 

The actor confessed that he did have some skepticism about bringing in such a huge name, but that Gaga turned out to be "a total pro" and "had her character down."  Josh Brolin, Mickey Rourke and Jessica Alba all star in the "Sin City" sequel, which is slated to hit theaters next summer. 

Gaga will also be starring in this fall's "Machete Kills."  Both films come from director Robert Rodriguez. 

Check out Joseph's interview with JAM'N 94.5 below:

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