One Direction star Harry Styles believes the band have "grown up" recently.

The group recently unleashed their new 'FOUR' and it sees the quintet evoke a more reflective feel.

Speaking to Access Hollywood, Styles said that he feels the group's music reflects a shift in maturity experienced by the singers too.

He said: "We've kind of grown up over the last few years. The music has kind of evolved with us.

"I think this is the album we're most proud of."

One Direction found fame on the X Factor in 2010 after being pieced together from solo contestants.

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Watch One Direction's 'Steal My Girl' video below: