Current age: 24
Career at 20: While Liam lost out to his brother Chris Hemsworth in the bid to play Thor, he was cast instead as the lead in The Last Song.
Relationship status at 20: Liam met Miley Cyrus on the set of The Last Song. The two dated on and off for almost four years — and even got engaged — before calling it off for good in October 2013.
Quoted at 20: Liam gave an interview while promoting The Last Song and spoke about his newfound fame: "It is pretty crazy. It is all really new to me. Last week has been the most crazy. I have been driving around Hollywood, and I'm seeing billboards of my face for The Last Song. To be in Hollywood and be driving around and seeing posters of my face is pretty surreal."