According to The Hollywood Reporter, Kick-Ass' violent nature has forced Hollywood studios to pass on making it. But Vaughn is such a believer in the project that he raised the money for the $30 million indie project himself.
The comic was written by Millar and drawn by John Romita Jr., and follows a high school dweeb who attempts to reinvent himself as a real-world costumed superhero named Kick-Ass who seems doomed to failure because he's not athletic or coordinated until he runs into real bad guys with real weapons.
The main character, dweeb Dave Lizewski, has not yet been cast. Vaughn also is talking to several high-profile stars to play parents or mobsters.
Vaughn wrote the adaptation with Jane Goldman and is producing with his Marv Films partner Kris Thykier.
Production is set to start in the fall.