While the seven-month-old prince was predicted to steal the show on his first official visit abroad, Kate's wardrobe is also drawing comments as the royal couple make their way through an adventurous itinerary Down Under.
Her outfits have ranged from a dressed-down nautical blazer to a Royal Air Force-inspired dress and a coat by Canadian designer Erdem Moralioglu. Use the interactive below to see what Kate is wearing and vote on your favourites.
Over their nearly three-week tour, the royal trio will visit 12 cities and plan to take part in activities as wide-ranging as a yacht race, paying their respects to victims of the 2011 earthquake in Christchurch and visiting Ayers Rock in central Australia.
In 1983, when Prince William was nine months old, he took a similar trip with his parents on their official tour of the same two countries.