Prince George of Cambridge

“I want to see my sister!” may be what Prince George was thinking as he gets on tiptoes to peek into the pram of Princess Charlotte flanked by his parents, Prince William and Catherine, Duchess of Cambridge, as they leave after Charlotte’s Christening.

The Duke and Duchess of Cambridge celebrated their son Prince George’s third birthday with a photo shoot at their Norfolk home.  (Matt Dunham / Associated Press)

Amid the hoopla during the christening of Princess Charlottee, photographer Mario Testino captured a different kind of moment between the little prince and Prince William.

A certain something captures the attention of Prince George as he is in the arms of Prince William, with Queen Elizabeth II, right, Catherine, Duchess of Cambridge, and the Prince of Wales, left, during the Trooping the Colour parade at Buckingham Palace in London.

That naughty little boy! Prince George of Cambridge sticks out his tounge as he is held by his nanny, Maria Teresa Turrion Borrallo, while waving from the window of Buckingham Palace during the Trooping the Colour parade.

“Hey, Mom, I’m getting tired!” may have been just one thought running through Prince George’s mind as he is held by his mother, Catherine, Duchess of Cambridge, and as his father, Prince William, tries to make him laugh during the Gigaset Charity Polo Match at Beaufort Polo Club in Tetbury, England.

A boy’s got to have fun, and that’s what Prince George attempts to do on the grass with his mother, Catherine, Duchess of Cambridge, during the Gigaset Charity Polo Match.

In a portrait taken by Catherine, Duchess of Cambridge, at Amner Hall in eastern England, 2-year-old Prince George holds his newborn sister, Princess Charlotte. Cue the “awws.”

Because one portrait simply is not enough, we were given another one taken by Catherine, Duchess of Cambridge, of her children as 2-year-old Prince George kissing newborn sister Princess Charlotte at Amner Hall in eastern England.

A special celebration! Prince William and his son, Prince George, wave as they return to St. Mary’s Hospital’s exclusive Lindo Wing in London after William’s wife, Catherine, the Duchess of Cambridge, gave birth to Princess Charlotte.

In this photo released by the royal family to mark Prince George’s first birthday on July 22, 2014, the little prince enjoys a visit to the Sensational Butterflies exhibit at the Natural History Museum in London.  (John Stillwell / EPA)

Catherine, Duchess of Cambridge, and her son, Prince George, attend the Royal Charity Polo during the Maserati Jerudong Trophy at Cirencester Park Polo Club in June 2014.   (Chris Jackson / Getty Images for La Martina)

Prince William has a grip on an excited George, who seems to want to get hold of a bilby -- also called George -- at Taronga Zoo in Sydney, Australia.  (Chris Jackson/Getty Images)

Catherine, Duchess of Cambridge, and Prince George visit the bilby enclosure at Taronga Zoo in Sydney.  (Chris Jackson / Getty Images)

The royal family gets a closer look at the Australian bilby.  (David Gray / Associated Press)

Catherine, duchess of Cambridge, and her son Prince George, leave the Defence Establishment Fairbairn as they head back to the U.K. after finishing their royal visit to Australia.   (Mark Nolan / Getty Images)

Lynne Cosgrove, left, wife of the governor-general of the Commonwealth of Australia, and Australian Prime Minister Tony Abbott see off Britain’s Prince William, his wife, Catherine, and their son, Prince George, at the Defense Establishment Fairbairn in Canberra.  (Saeed Khan / AFP / Getty Images)

Prince George plays with his mother, Catherine, the Duchess of Cambridge.  (Marty Melville / Associated Press)

Britain’s Prince William and his wife, Catherine, Duchess of Cambridge, arrive at Chapel Royal in St. James’ Palace with their son, Prince George, for the christening of the 3-month-old royal. The fervor surrounding George’s birth in July 2013 illustrated the enduring popularity of the royal family.   (John Stillwell / AFP/Getty Images)

The couple welcomed their son, Prince George, the third in line to the British throne, on July 22, 2013.  (Leon Neal / AFP/Getty Images)