In between playfully lobbing cough drop wrappers at co-star Josh Hutcherson's head as he walked the red carpet ("All this fighting is real," she joked), the Oscar winner took time to chat with us about her return to the big screen as Katniss Everdeen.
"She came out of the games a completely different person. It was kind of a life-changing event [with] Peeta." J Lawr explains. "She's picking up the pieces and she's suffering from post-traumatic stress."
With all the furor surrounding the back-to-blonde beauty's new pixie cut, we had to ask how being under the microscope jibed with her refreshingly body-confident image.
"I just don't pay any attention to it," she told us. "It's the same rules as middle school and high school. Don't listen to the bitches!"
You said it, girl. Like the sign in the Leicester Square crowd said, "J-LAW, will you be my best friend?"