Kate Middleton Dress
Kate Middleton arrives in Australia wearing a radiant yellow dress. Reuters

Kate Middleton, carrying her son Prince George and accompanied by Prince William, touched down in Sydney in a shining yellow dress.

The Duchess who arrived at Sydney airport on Wednesday wore a radiant yellow dress by London-based Serbian fashion designer Roksanda Ilincic.

The dress was Kate's honour to the nation as yellow is one of the national colours of Australia.

However, Prince William didn't seem too pleased with his wife's outfit, which she apparently changed in-flight when flying from Wellington. The Duchess bid adieu to New Zealand in a navy Rebecca Taylor dress and arrived in Australia in the sunshine yellow outfit.

"William said I look like a banana," Kate told Heather Easton, a member of the crowd waiting to get a glimpse of the royal couple at Sydney's Royal Opera House, according to Mail Online.

Notwithstanding William's joke, Kate looked stunning in her yellow ensemble on a sunny day in Sydney.

The wool-crepe dress from the designer's spring/summer 2014 collection featured a splash of white on the inside of the arm-length sleeves as well as on the left side at the bottom.

The 32-year-old teamed her dress with shiny nude heels, white pearl drop earrings and let her hair loose with two tresses from front swept and pinned at the back, supposedly done by the Duchess' personal hairdresser.

It's been a royal tradition of honouring a host country by incorporating its national emblem or colour into an outfit. During her visit to New Zealand, the Duchess honoured the nation by wearing a black evening dress embroidered with silver ferns. The colour black and the silver fern are symbols of New Zealand.

Have a look at the pictures detailing Kate Middleton's first dress from her Australia tour below.