ansel elgort
Credit: Jeffrey Mayer/WireImage

We've seen Ansel Elgort rock the red carpet in tailored suits and slicked back hair time and time again, but the Fault in Our Stars and Divergent star—who turns 21 today—admits his personal style is much more casual than what we're accustomed to seeing at movie premieres and high-profile events.

"My personal style is sort of eclectic. I'm an actor so I like to use style as a way to feel different about myself at the end of the day, depending on how I want to feel," the New York-native tells InStyle, citing his go-to uniform of jeans and a white tee while out in Brooklyn. When attending a star-studded event, though, he opts for a "really fancy" ensemble. "People perceive you differently based on what you’re wearing so I think style is important. My style goes all over the place. It's tough to describe." Despite his varied taste, something tells us Elgort will be dressed to the nines to ring in the big 2-1!