The fourth member is their cousin, guitarist Matthew Followill, 24. Scruffily bearded, with a wracked, edgy manner, Caleb is hungover, sipping black coffee after a long night celebrating news that the Kings have just scored their first British number-one single with the scorching, propulsive Sex on Fire.
In case you couldn't work it out from the title, it is a song, Caleb explains, "about great sex".
Look at all the hurricanes and earthquakes and everything that's going on, to me its almost like what has been done in America has brought on the feeling of a religious war, and along with that a lot of other prophecies are coming to pass.
It scares me."The complexities and contradictions of Caleb and his siblings are what makes the Kings of Leon so fascinating.
The record, the follow-up to their blockbuster 2008 release Only by the Night, will feature 13 songs, which the band recorded with producer Jacquire King (Norah Jones, Be Your Own Pet) and longtime mentor-collaborator Angelo Petraglia in New York City.
It was almost as if God was smiling down on me, saying, 'Finally, you made a decision, you quit struggling with yourself.' And the voices went away.
How will the story stack up against the greatest films about business?
Europe has been a place of battles and political intrigue for centuries.
I was really lonely because we were always in a different place, usually sleeping in a back room at a church.
It was always really scary in there, so I would put my little radio under the pillow and just listen to the oldies station, listen to doo wop and Stand By Me, and that finally got me to where I'd fall asleep."His belated discovery of contemporary bands was a revelation. I heard stuff that made me forget about all the things I would hear in church every day, things that made me feel as if everything was wrong.