And it totally sounds like Jake's upcoming thriller, Nightcrawler, is going to be nothing short! We mean, when we hear about how willing he was to get into his new gaunt and thin look, we KNOW it's serious business!
Just look at the 32-year-old attending the 17th Annual Hollywood Film Awards on Monday, looking completely different (above)!
He'll be playing a freelance crime reporter named Lou who finds himself in the decrepit underground world of Los Angeles. Here's what he said about his new look and the role: