Ansel Elgort is best known for his role as Gus in The Fault in Our Stars — but there is more to the actor than meets the eye.

Along with acting, Ansel is also a world famous DJ who goes by the stage name Ansolo.

"My favorite thing to do is just to sit and work on music on my computer," he told Rolling Stone. "If I'm shooting a movie, there's so much downtime on set. If I'm in a different state or country with people I don't really know that well and everyone is tired from working, I go home and make music."

MORE: Click Here to Buy 'The Fault in Our Stars' on Blu-Ray!

In honor of his 23rd birthday, we are looking back at fun facts only die-hard fans of the YA novel and movie would know.

Along with Ansel's secret DJing skills, fans would also be surprised to know that Shailene Woodley was not the only actress to be considered for the role of Hazel.

For more facts you didn't know about TFIOS, click through the gallery below, okay?