It was more than just a fresh spring hairstyle that http://www.people.com/people/renee_zellweger - Renée Zellweger had in mind when she chopped off her hair into a dramatic pixie do. “It was sort of a job hazard sort of thing,” Zellweger told PEOPLE at the Tribeca Film festival premiere of her film My Own Love Song last night, referring to the tress-stress that actresses undergo to change their looks with each new role. “It’s not worth keeping after a while,” she explained. “It had to go. Shed the old.” To get the job done right, she turned to hair-cutter to the stars Lori McCoy-Bell. “She works on sets, cuts hair in trailers on films,” Zellweger says. “She cut it in the dining room. She was very brave. She just grabbed chunks of it, twisted it and shredded.” The end result left the Oscar winner smiling. “She did a great job—I was just really glad that the other stuff was gone.” –reporting by Jeffrey Slonim