The 22-year-old actor, who recently proposed to the former 'Hannah Montana' star, said he knows she is the right person for him, reported Femalefirst.
"My fiancee. She's extremely happy and has a sense of humour about life. And she has taught me you can step back and not take everything so seriously. Happy, positive, fun - those qualities are good in anyone," he said.
Hemsworth said Cyrus is very cool when it comes to his fashion choices and would never tell him what to wear.
"She doesn't care. My style is very inconsistent. One day, I'll put together a cool outfit, and the next, I'll look like a homeless person."