Tom Felton: Draco Malfoy
Pictured in Harry Potter and the Sorcerer's Stone in the inlay and ten years later at the 2011 Deathly Hallows: Part 2 premiere afterparty (with a bonus Neville Longbottom!), Tom Felton has grown up quite a lot since his days as Harry Potter's earliest arch-nemesis.
Tom's still working, too! He even has a project with David Boreanaz, Full Circle, in pre-production.