Harry Styles insists that One Direction's music has ''grown up'' and ''evolved'' as they have changed as people.
The Steal My Girl hitmakers have just released their fourth album Four and Styles says it is the record they are most proud of.
Speaking to Access Hollywood, 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."
Four features a total of ten tracks co-written by the boy band.
The 1D lads minus Zayn
