Liam Hemsworth and Miley Cyrus
03/13/2012 at 05:00 PM EDT
The Hunger Games
are a brutal fight to the death requiring smarts, resourcefulness and brute strength to win. So if, say, Liam Hemsworth were competing in the Games against his girlfriend Miley Cyrus
, who would take it?
"Probably her," Hemsworth, 22, said on the black carpet alongside Cyrus, 19, at Monday's massive Hunger Games premiere
in L.A. "She's a tough girl, that one."
The Aussie actor also marveled at the mania surrounding Games
, which drew thousands of screaming fans to the premiere.
"It's like a good punch to the head," he said of the raucous scene, noting that his brother Chris
, 28, who starred in last summer's superhero blockbuster Thor
, has experienced fan pandemonium in the past.
"My brother had somewhat been through it," said Liam. "And he's always been a big role model in my life. I try to take as much knowledge from him as I can."
Meanwhile, Hunger Games
's youngest star – 13-year-old Amandla Stenberg – sought advice from the film's Girl on Fire herself, Jennifer Lawrence
"I talked to Jen about [the mania]," Stenberg said at the premiere. "And she was like, 'Just be prepared. It is gonna be crazy.' So she did give me a heads-up."
Reporting by SCOTT HUVER