Movies
WENN
The 56-year-old is currently shooting his scenes for the film in New York City, E! Online reports.
Gunn's role in the project is yet to be revealed, though it is thought that he will play himself.
Sex And The City actress Sarah Jessica Parker appeared as a guest judge on Project Runway in 2007.
Parker recently admitted that she is frustrated by the frenzy surrounding the update's production.
The movie is to open in cinemas on May 28, 2010.
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