For me:
Leonardo Dicaprio: Of course he's uber famous, but he was just a pretty boy for girls in Titanic & Romeo + Juliet. I wrote him off as a little sh*t at that time. As he got older, man, did he become a real man. He sort of caught my attention with Catch Me If You Can. But by Blood Diamond, I was applauding his acting chops. And holy hell, Revolutionary Road was jaw droppingly haunting. What a performance from the reunion of Kate Winslet and Leo. Both matured into some serious bad asses.
Yours?