5 Seconds of Summer Are Punk-Pop Perfection on 2014 Billboard Music Awards Red Carpet [PHOTOS]

We'll admit it -- we got a little giddy when we saw 5 Seconds of Summer walking the 2014 Billboard Music Awards red carpet. It may be a major U.S. appearance for the boys, but they looked totally at ease working it for the cameras.

The guys stuck to their rocker style, looking coordinated but not too matching, in jeans, T-shirts and flannel. From their perfectly coifed hair to their skinny jeans, these guys are performance-ready. (And we can't wait to see them rock out!)

Check out all of the members of 5 Seconds of Summer in the pics below!

All of the guys look casual, yet polished. We love it!

5 Seconds Of Summer

It's official: Ash can work a hat with the best of 'em!

Ashton Irwin

Check out Calum's smolder! Yep, our hearts just melted a little.

Calum Hood

We're totally digging Mikey's hair!

Michael Clifford

Loving the leather and plaid combo, Luke! It's a total '90s throwback and he makes it work.

Luke Hemmings