The Rent star, who played prostitute Gail in the 2005 adaptation of the graphic novel, expressed her concern that she would not be able to fit into the character's revealing dominatrix outfit by the time that the movie enters production.
She told Contactmusic: "The last time I saw [director] Robert Rodriguez was a month ago and he really wants to make Sin City 2 happen. I said, 'I understand you've been taking your time, but if you want me to wear the outfit that fits into one hand, dude. I'm not getting any younger'."
Fellow Sin City star Jaime King recently explained that the long-awaited sequel, which is expected to begin filming this year, had been delayed due to creative differences between the studio and filmmakers.