Miley Cyrus and Liam Hemsworth have reportedly called off their engagement over arguments about when they should have children.

The 'Wrecking Ball' singer and the 28-year-old actor - who first split in 2013, before reconciling their romance three years ago - are said to have gone their separate ways six years after he first popped the question because Miley kept delaying plans to settle down and start a family.

A source told OK! Australia: "He wants kids and doesn't want to keep putting it off but it's not quite the timeline Miley had in mind ... he is left heartbroken.”