But before they do, let's take a look back at all of Duchess of Cambridge's outfits from New Zealand – click on the photo below to see the full gallery.
Kate kicked off the royal tour in style, stepping off the plane in a red double-breasted coat dress from Catherine Walker with oversized gold buttons.
She accessorised with a matching hat and a diamond and platinum brooch in the shape of a fern. The brooch was a gracious gesture towards her host country – the fern is New Zealand's national symbol, and was given to Queen Elizabeth II on a tour of the country in the 1950s.
It is thought to be on loan to Kate for her tour.
For her next engagement, Prince George's first official playdate at The Government House in Wellington, Kate wore a Tory Burch monochrome dress.
A bespoke, powder-blue coat designed by Sarah Burton for Alexander McQueen was Kate's next choice, for a visit to Blenheim's Aviation Heritage Centre.
Later on that day, Kate accompanied her husband to an art unveiling of a portrait of Queen Elizabeth sporting a simple yet elegant embellished black dress by one of her favourite designers, Jenny Packham.
The royal wore a navy, double-breasted blazer with gold buttons for two of her engagements.
She also wore a turquoise blue pleated dress by Emilia Wickstead at Dunedin Airport. The dress was identical to the pink number she wore for the Buckingham Palace Garden party in 2012.