Harry Styles' curls take centre stage as One Direction perform at BBC Radio 1's Big Weekend

Fans are obsessed with his brunette curls.

So it may come as a bit of a shock that Harry Styles may actually rely on extensions to create his famous mop.

Singer Lily Allen made a joke on Twitter about the teen heartthrob's famous locks as she wrote: 'Just saw Harry Styles having hair extensions put in #exclusive'.

Bandana lover: A claim was made about how Harry Styles manages to create his famous mop

The Sheezus singer then shared an instagram snap of the pair pulling funny faces which she captioned: 'LOLz with @harry_styles #r1bw'.

Lily had bumped into Harry backstage as they took part in BBC Radio 1's Big Weekend which was being held in Glasgow.

Harry wore an appropriate jumper considering his heartthrob status as he sang along in a green jumper with the word, 'Obsession', emblazoned upon it.

Exclusive: Singer Lily Allen made a joke on Twitter about the teen heartthrob's famous locks

Hey there: The Sheezus singer then shared an instagram snap of the pair pulling funny faces which she captioned, 'LOLz with @harry_styles #r1bw'

Superstar: The singer joined his bandmates Zayn Malik, Liam Payne, Niall Horan and Louis Tomlinson on stage

Sing it loud: Harry teamed the moss green jumper with black skinny jeans and brown suede boots