The 3-year-old prince and 16-month-old princess could hardly contain their excitement at the party, where Charlotte was seen walking and talking for the first time in public. The toddler exclaimed, "Pop!," as she hugged a balloon arch on the ground and later called her father, "Dada."
Charlotte also excitedly bounced on a dog named Moose while she and her big brother, George, played with a bubble squirt gun.
George, who seemed a bit subdued next to his boisterous sister, climbed aboard a pony with the help of his parents and hugged his baby sister while they examined the balloons. When Kate took Charlotte to have a balloon animal made, George, who was playing with a rabbit, quickly ran over saying, "But I want one. Can I have one?"
Charlotte wore a Pepa and Company blue smocked dress, which retails for $100, and a tiny blue sweater with a tiny blue bow holding back her brown hair. George was in his trademark shorts in maroon with a blue sweater.
"The Duke and Duchess are really pleased to have this opportunity to introduce their children to Canada and it's great that they have the chance to play with other children while they are here," said a Kensington Palace spokesman.
The Cambridges have bern residing at Government House, the official residence of the Queen's representative in British Columbia. George and Charlotte's nanny, Maria Teresa Borallo, accompanied the family from London to keep the children occupied while their parents are attending engagements.
Their Canadian hosts pulled out all the stops by creating a child-friendly nursery at Government House, complete with toys and teddy bears. Local gardeners even added rubber ducks to the fountains in the grounds of Government House for George and Charlotte's enjoyment.
William and Kate's whirlwind tour of Canada has seen them dazzle at a diplomatic reception at Government House and travel to Vancouver and Bella Bella, British Columbia. They also traveled to Kelowna, in the beautiful Okanagan Valley, where they met with University of British Columbia students and sampled local delicacies at the "Taste of British Columbia" festival at a local winery.
Charlotte and George stole the show in their only prior appearance in Canada, when the family arrived in Victoria on Saturday. Charlotte, on her first royal tour, was carried down the plane’s steps by her mother, while George, on his second royal tour, walked on his own, holding his parents’ hands and watching the planes and gathered crowd in awe.