The formerly blond actor, 21, recently darkened his hair for the highly-anticipated movie, which costars Jennifer Lawrence as heroine Katniss Everdeen and Josh Hutcherson as Peeta Mellark. See more photos from the Hunger Games set.
Hemsworth and Lawrence, 20, began shooting the film trilogy in Shelby, North Carolina on Thursday.
"Liam is just a solid brick of muscle. You look at him and you're like, 'Oh, okay, great!'" Lawrence raves to Entertainment Weekly. "But he's got depth and he's interesting, and at the same time, he's natural and he flows."