And he was clearly loving every minute of his new role within the royal family, judging by his sunny demeanour in New Zealand.
The smile hardly left his face for a moment as the sports-loving Prince joined in a training session with some youngsters at Eden Park rugby stadium in Auckland.
Joking with the children about the photographers, the 27-year-old – wearing a blue, green and white Rugby World Cup 2011 shirt with 'Wales' on the back – said: "Don't worry if you break their cameras."
He also got a chance to have a go at the country's other great sporting passion - sailing. After arriving at Waitemata Harbour, Wills joined the crew aboard an America's Cup yacht, helping them hoist the main sail and taking the wheel for a short while.
As the two day visit to the country got underway, William revealed his pride at representing his grandmother the Queen.
"It means an awful lot. She is extremely busy and I want to do something good and keep the standards up that she had led the way with," he said.
He arrived at Auckland airport after a flight which lasted over 24 hours and received a traditional Maori greeting as he visited Wellington's supreme court.
On the second day of his trip there was the chance for the second-in-line to the throne to get acquainted with the country's national symbol.
During a visit to Kapiti Island Nature Reserve he was introduced to a tiny kiwi bird before touring the island, which is located off the west coast of the North Island of New Zealand.
On Tuesday William will move on to Australia, marking the first time he has returned to the country since he was there with his parents in 1983 as a nine-month-old baby.