On the other hand, William's once "rebellious" brother, Prince Harry, seems to take on his role and duty more seriously as he was spotted planting a tree in Epping Forest near London on March 15. Prince Harry met school children during a visit to the Field Studies Centre at High Beach that day, and also unveiled a plaque dedicating the Epping Forest to the Queen's Commonwealth Canopy initiative.

Prince Harry plants a tree in Epping Forest near London on March 15, 2017. [Photo/VCG]

The Commonwealth service, which was missed by Prince William, is organized by the Royal Commonwealth Society, and is the largest inter-faith gathering in Britain designed to highlight the diverse attributes of the Commonwealth, made up of 2.5 billion people.

A Kensington Palace spokesman said that William's schedule was private and refused to comment any further on it.

The Duke and Duchess of Cambridge, Prince George and Princess Charlotte depart from Victoria Harbour Airport in Victoria, Canada, on the eighth day of the Royal Tour to Canada on October 1, 2016. [Photo/VCG]