Catfish and the Bottlemen are back in the U.S. and they made their network TV debut on the 'Late Show With David Letterman' last night (Jan. 7).

Looking cool and calm, the U.K. band played their hit track, 'Kathleen,' which is off their debut album, 'The Balcony.' Although they've been impressing crowds all over the place, they showed even more refinement in their 'Letterman' performance. But even with that flair, frontman Van McCann was not afraid to wail on the mic and show just how big of a rocker he can be -- check it out in the video above.

By the end of the track, it was clear that the audience was completely into it. And by the sound of Letterman's voice, he was just as impressed -- even though he did start to chuckle when he initially introduced the band and their cheeky album cover overtook the screen.


Catfish and the Bottlemen are heading out on tour starting on Feb. 8 in San Diego. 'The Balcony' is out now.