It's official: Alt-J are making their rounds on the U.S. late night TV circuit.

As the acclaimed British outfit prepare to release their eagerly anticipated sophomore full-length, 'This is All Yours' on Sept. 22, the lads from Leeds have been hitting the talk shows in support. Just a few days ago, they performed on 'The Late Show with David Letterman,' and last night (Sept. 8), they took their sparse stage show to 'Conan,' where they again played their latest single, 'Every Other Freckle.'

Check out video of the performance above and compare it with their Letterman appearance below.

Alt-J Perform 'Every Other Freckle' on 'The Late Show with David Letterman'