The decision to go with Austin caught some folks by surprise -- fact is, he's relatively unknown compared to his competition, but looks at these pics and it's easy to see why he was tapped for the role. Dude's got the hair and the look working!
His appearance and acting skills obviously impressed director Baz Luhrmann and co. enough to land the potentially career-changing gig.
As for Vanessa, she wrote on social media Monday that she was "OVERRRR THE F***ING MOOOOOOOOONNNNN" for her man, with whom she's been with since 2011.
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BTW, just 'cause you might not have heard of Austin before today ... that doesn't mean he's a hound dog in the acting game. He's been in the biz since 2006, having appeared in numerous hit series like 'Ned's Declassified,' "Zoey 101," "Life Unexpected," "Switched at Birth," "The Carrie Diaries," "The Shannara Chronicles" and tons of other shows and movies.