Prince William and Kate Middleton are heading to Australia to tour bushfire-ravaged coastal towns, according to reports.

According to the Sydney Morning Herald, talks have been underway between the federal government and Kensington Palace for weeks, with an official invitation from Prime Minister Scott Morrison expected in the coming days.

The Duke and Duchess of Cambridge were among the many royals – including the Queen and Prince Philip and Prince Harry and Meghan Markle – who issued personal statements last month expressing their sympathies at the devastating bushfire crisis in Australia.

It's understood their tour will include towns along the east coast of Victoria and New South Wales, but no details have yet been confirmed.

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Prince William visited the flood-damaged areas of Queensland and Victoria in March 2011, while Prince George accompanied the Duke and Duchess of Cambridge in April 2014.

William also made it to New Zealand in April last year in the aftermath of the Christchurch mosque shootings.

The Duke of Cambridge's first visit to Australia was when he was nine months old when he joined Prince Charles and Diana's official tour of Australia and New Zealand in 1983.