Florida Georgia Line kept it casual at the 2017 Billboard Music Awards when they walked the red carpet before the broadcast on Sunday night (May 21).

Tyler Hubbard wore a very Las Vegas sports coat and pants over an open-collared black shirt with a wide collar, matched with black shoes and no socks and topped off with sunglasses. His duo partner Brian Kelley opted for skinny jeans with a blue shirt with a kerchief tied around his neck, with a jacket over the top and a hat and sunglasses.

The superstar duo are the most-nominated country act at the 2017 Billboard Awards, earning nods for Top Duo / Group, Top Country Artist, Top Country Album, Top Country Song and Top Country Collaboration. They are also set to perform with John Legend during the live broadcast, singing their smash hit “H.O.L.Y.” and Legend’s “Surefire.”

It's actually not the first time they've collaborated.

"“We got to write a song together in LA [recently],” Hubbard revealed on the 2017 Billboard Music Awards red carpet. “He’s a great dude … so it just kind of organically worked out. We’ve been big fans of him for years and respect him a lot.”

Watch: Florida Georgia Line, John Legend Perform "H.O.L.Y"