Prince George and Princess Charlotte's best photos together

1/19

Doting big brother, Prince George, placed a gentle kiss on his newborn sister, Princess Charlotte's forehead not long after her birth in 2015.

Photo: Duchess of Cambridge

2/19

The little Prince proudly held on to his baby sister, while sitting on a couch, for their first portraits together.

Photo: Duchess of Cambridge

3/19

George was one happy older brother sitting perched up with Princess Charlotte in his arms at their family's country home Anmer Hall.

Photo: Duchess of Cambridge

4/19

Big brother's looking out! George peered into his sister's pram at her July 2015 christening held at the St. Mary Magdalene's church.

Photo: Matt Dunham - WPA Pool/Getty Images

5/19

Season's greeting from the Cambridges! The little family posed for a sweet photo together in 2015. Attached to the portrait a message read: "The Duke and Duchess are hugely appreciative of all the warm messages they have received about their family this year and are very much looking forward to their first Christmas as a family of four."

Photo: Chris Jelf

6/19

Charlotte and George were a pair of adorable snow bunnies, while on a ski holiday in the French Alps with their parents.

Photo: John Stillwell - WPA Pool/Getty Images

7/19

The royal siblings had fun in the snow during their family vacation in France.

Photo: John Stillwell - WPA Pool/Getty Images

8/19

Prince George and Princess Charlotte hammed it up for the cameras, smiling and waving from the balcony of Buckingham Palace during the 2016 Trooping the Colour.

Photo: Samir Hussein/WireImage

9/19

The royal brother and sister made the same gesture and face as their mother pointed out to the distance during the Trooping the Colour.

Photo: Samir Hussein/WireImage

10/19

Charlotte and George both gazed up to watch the RAF fly over Buckingham Palace.

Photo: Samir Hussein/WireImage

11/19

The Duke and Duchess of Cambridge's children were joined by their cousins at Windsor Castle for a photo with their great-grandmother, Queen Elizabeth, in honor of her 90th birthday.

Photo: Annie Leibovitz/Getty Images

12/19

Charlotte had her parents and brother George by her side as she embarked on her first royal tour of Canada in 2016.

Photo: Karwai Tang/WireImage

13/19

The Cambridge siblings appeared intrigued by their new surrounding while on the tarmac of Canada's Victoria Airport, where they were beginning their royal tour of the North American country.

Photo: Karwai Tang/WireImage

14/19

George got his hands on an orange bubble gun toy, which he use to squirt bubbles at his sister and father during a children's party in Victoria, Canada.