Harry Styles and Nathan Followill have a "really weird relationship"

Caleb told The Sun newspaper: "Nathan has like a crush on him.

"Nathan and him, they have matching tattoos, it's really weird. They have a really weird, strange relationship."

Caleb also admitted his brother has one of Harry's guitars in his collection which he assumes was a "probably gift of love".

The pair have also been known to suck on a sweet treat together as in August 2014, the drummer shared a picture on Twitter of him and Harry, 22, indulging in popsicles.

She tweeted: "Popsicle time with @Harry_Styles #kidsatheart #sugarfree #notreally (sic)"

In November 2013, Nathan revealed he had been inundated with around

20,000 new Twitter followers after Harry had started following him on the social networking site.

He said: "I honestly think I got an extra 20,000 followers when that kid followed me - teenage girls asking me to set them up with him."

Nathan also issued Harry and his fellow One Direction bandmates - Louis Tomlinson, Liam Payne, Niall Horan, and then Zayn Malik - with some advice about letting girls into their hotel rooms.

He said: "If you're going to have a party in a hotel room, have a box at the door and take the girls' phones - that's what gets kids into trouble these days. Every phone is a camera."