Kings Of Leon bandmates and brothers Caleb and Nathan Followill have a fiery relationship - they frequently brawl and have even come close to stabbing each other, according to a documentary maker.

Stephen C. Mitchell has known the Sex on Fire hitmakers for 10 years and has filmed their rise to fame in his new film, Talihina Sky, which charts the history of the band and contains rare footage of them on the road.

And Mitchell has revealed frontman Caleb and his drummer brother Nathan are "too close" and often get caught in violent altercations over a clash of opinion.

He tells Spinner.com, "Those two have notoriously gone at each other over the years. I mean broken shoulders, pulled hair, trying to stab each other. Those two are like twins almost. They're so close but they're too close, if that makes sense."