In the 2018 Amazon Prime documentary "William & Kate: the Journey", royal biographer Katie Nicholl revealed how the Duchess of Cambridge's stunning looks sparked rumors when she and Prince William first stepped out to show their newborn daughter to the world.
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"Well done for remembering", the Queen's grandson, 36, said as he looked over the card and thanked the children, as captured in a video from royals reporter Rebecca English on Twitter. "I said it was pink and she said that's Charlotte's favourite colour, too".
Clutching a cuddly helicopter, William remarked, "Look at these, they are fantastic!" "Louis will be chewing that before long!"
George, who is a big fan of helicopters, will be glad when he receives a plastic toy of the aircraft.
There was an extra present, a model helicopter, for George and his father quipped: "I can not go back without a helicopter, George will never forgive me". George will never forgive me!"The children lovingly put together a number of colourful cards, too: "Charlotte's going to love this".
William has an official engagement in the day, meeting pilots and paramedics from London's Air Ambulance.
The charity is celebrating its 30th anniversary this year, and William visited their staff, patients and their families at a tea party marking the anniversary.
After the royal unveiled a handsome plaque to commemorate the charity's 30 anniversary campaign - of which William is a new patron - two adorable kids presented him with some gifts.