We can't believe it, but Nat Wolff is celebrating his 20th birthday today! We first loved the actor and musician when he was a kid on Nickelodeon's The Naked Brothers Band with brother Alex, and now we're obsessed with his amazing movies like The Fault in Our Stars and can't wait to see him in the upcoming Paper Towns film.
Nat's style has changed so much since he was first hitting red carpet events with his younger brother: the guys were both cute then, but now Nat has crafted a totally grown-up and sophisticated style that we really love.
Click through the gallery above to watch Nat's style transform right before your eyes. Then, make sure to wish him a happy birthday in the comments section below!