"I'm queer," he told Out magazine in a 2012 interview
. "I have a lot of really wonderful friends who are of very different sexes and genders. I am very much in love with no one in particular."
Miller has been cast as the Flash in the forthcoming blockbuster "Justice League Part One" which is set for 2017 and the standalone film "The Flash" which is expected to open in 2018. He has previously attracted attention from critics and fans for his roles in dramas such as "The Perks of Being a Wallflower" and "We Need to Talk About Kevin."
1. Miller started young
Miller, a New Jersey native, trekked into New York City at age 6 for a role in the Philip Glass contemporary opera "White Raven." The arts are in his blood, he has said.
"My mother is an artist through and through," he told Interview magazine.
"She's a modern dancer. And I think the way she raised her children was with a playful, curious inquiry into the world.
2. He's still young
Despite already having longevity in the business, winning raves from respected co-stars like Tilda Swinton and being a bit of a darling of the indie movie world, the actor is only 22 years old. Independent film has been a perfect training ground for him.
"Everything you do as a young and budding artist will be, in some way or another, independent," Miller said.
"And then if you can be doing independent work that is subsidized in some way, that's a huge, beautiful leap in and of itself."
3. Speaking wasn't always easy for him
The actor can actually thank his career -- in part -- for helping him overcome a major challenge.
Miller suffered from such a bad stutter at an early age that he was introduced to singing as a way to help him. Thus, his career in opera was born.
4. You may have seen him locking lips with....
The actor and his "Beware of the Gonzo" co-star Zoe Kravitz (daughter of rocker Lenny) were photographed in a make-out session that sparked speculation the pair had gotten really, really close on set. The movie about an underground student newspaper was filmed in an actual high school which may have helped contribute to their possible summer romance.
"It was fun," Kravitz said of filming.
"It was just like being in school again.
5. He's had some legal trouble
An arrest in 2011 for alleged possession of marijuana garnered Miller some headlines and unwanted attention, but there were at least two people who weren't surprised. He told Details magazine
that his parents weren't at all shocked when they learned of the charges.
"My parents had been gritting their teeth for that phone call for a long, long time," he said.