Fame hasn't changed Jennifer Lawrence.

Although the 22-year-old actress picked up the Best Actress Oscar for her work on 'Silver Linings Playbook' earlier this year, her 'Hunger Games: Catching Fire' co-star Liam Hemsworth says she hasn't changed at all since they first met a few years ago.

Speaking on 'Good Morning America', he said: ''You wouldn't even know [Jennifer had won an Oscar]. She's great. Nothing has gone to her head over the last few years.

''When I first met her and worked with her she was full of life and she brings such a great energy to set. When you're shooting the tough stuff like the themes in the 'Hunger Games', it can be a little dark at times and she's got that great energy about her and she's still that way.''

Along with working with Jennifer on the 'Hunger Games' movies, Liam recently shot 'Paranoia' with Harrison Ford and Gary Oldman, who he credited for making him a better actor.

He explained: ''It was intimidating at first. But they're such good guys. They're some of the most well-prepared actors I've ever worked with. As a young actor, it makes you prepare more.''