Niall Horan strips to sing

Niall Horan records songs naked.

The cheeky Irish singer makes up one fifth of One Direction, alongside bandmates Harry Styles, Zayn Malik, Louis Tomlinson and Liam Payne.

Niall, 19, is sure to set teenage hearts racing after revealing he likes to belt out tunes in the buff.

"I've been doing it for a while. I recorded What Makes You Beautiful in my boxers.

"What Makes You Beautiful was the first time I did it because it was really warm in the studio, and I've done it ever since," he teased Heat World.

"I sing better naked."

One Direction are currently promoting their behind-the-scenes movie This Is Us and are also working on their upcoming third album.

Liam - who turns 20 today - revealed what fans can expect from their new music.

"[It's a] very rock direction," he told MTV.

"We actually spent a lot of time writing this album. We're very proud of it, so we can't wait for it to come out.

"It's very live sounding, very rock-y. [It's] quite retro, but it's very different so we are hoping people will kind of adjust to the music with us."

This Is Us hit cinemas this month and is already delighting fans with never before seen footage.

Niall will have to be sure to put on some clothes if he wants to go and see himself on the big screen.

"The movie is out today! Wohooooo ! night go sneak into a cinema somewhere tonight and watch! Hahahah (sic)" he tweeted.