Actor Joseph Gordon-Levitt has revealed that Lady Gaga was a "total pro" when she filmed her cameo appearance in 'Sin City
The singer has a cameo role in the crime thriller sequel, and Gordon-Levitt has claimed that she surprised him with her talent in front of the camera, Contactmusic reported.
He told radio station Jam'n 94.5 that she did a really good job and that she's a great actress.
