Pop star Harry Styles's bromance with Kings Of Leon rocker Nathan Followill has resulted in them getting matching tattoos.

Harry, 22, has long listed the family four-piece from Nashville, Tennessee as one of his favorite acts, and has been friends with frontman Caleb Followill and his bandmates for more than two years.

According to Caleb, 34, his older brother Nathan, 37, has become so close to the Steal My Girl singer that he and Harry have inked themselves with identical body art.

"Nathan has like a crush on him (Harry)," Caleb spilled to British newspaper The Sun. "Nathan and him, they have matching tattoos, it's really weird. They have a really weird, strange relationship. I think Nathan is just his number one groupie."

Harry has even given Nathan one of his guitars, a present which the Sex on Fire singer joked is, "probably a gift of love".

The drummer, who is married to singer-songwriter Jessie Baylin, and the rest of the Kings of Leon have been busy in the studio, with WALLS, their first album in more than three years which is released Friday (14Oct16).

Meanwhile Harry has been branching out from music, as he's been filming a role in director Christopher Nolan's forthcoming Second World War epic Dunkirk.

However he now looks set to return to the studio, as in June (16) he signed a solo deal with Columbia Records worth a reported $80 million .

Harry's old One Direction comrades are also moving down the path to solo stardom, with Zayn Malik the first to put his own record, Mind of Mine, out in March (16).