The Daily Telegraph The 21-year-old, whose mother is an Australian, originally from Queensland, feels very at home with co-star Chris Hemsworth.
"I feel so incredibly comfortable around him. There is a very particular Aussie mentality and he has got it. He epitomises it,'' Stewart told The Daily Telegraph.
"He's really smart and he's very impassioned, but he's also really funny and light and kinda loud. His accent is funny. I can't do it, I'm always trying to mimic him but I cannot do it!"
"I have an English accent in the film, that's much easier for me for some reason. That Australian thing is tough," Stewart said