While the Duke, 31 and the Duchess, 32, look into the camera, the young Prince smiles at the family’s pet spaniel, Lupo.

The moment was captured by celebrity photographer Jason Bell, who is no stranger to snapping pictures for the royals. Bell was the photographer of choice at Prince George's christening on 23 October 2013 where he took four official portraits of the family and immediate relatives.

Kate Middleton, who celebrated her first Mother's Day on Sunday, opted for a cream frilled blouse for the portrait while Prince William wore a light blue shirt. The young Prince, however, had the best outfit with a white shirt and custom-made baby blue cashmere sweater, which featured his name stamped across the front.

Prince William, Kate Middleton and Prince George in new royal family portrait