Happy 34th Birthday , Prince William !
To celebrate the royal's special day, click through the gallery to see his best childhood pics with brother Prince Harry !
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December 1986
Harry and William pose with their parents at the family's Kensington Palace home.
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May 1985
The royal family was photographed visiting Venice, Italy in the mid-1980s.
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October 1985
William, Harry, and Diana pose at Kensington Palace.
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October 1985
A young William and his brother, Harry, pose with their father, Charles, at Kensington Palace.
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July 1986
Diana, Charles, and their two boys pictured in Tetbury, England.
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July 1986
William and Harry posed in front of Highgrove House in matching, mini army uniforms in summer 1986.
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July 1986
The young boys were once spotted playing with their mother outside Highgrove House.
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April 1987
William and Harry playing in Scotland in the late 1980s.
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June 1987
The brothers were adorably photographed at Cirencester Park Polo Club in summer 1987.
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June 1987
William and Harry posed with their grandmother, Queen Elizabeth, at a polo club in Windsor, England.
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August 1987
Charles and Diana with their children in Spain in summer 1987.
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June 1988
Harry stuck his tongue out at photographers while standing on the Buckingham Palace balcony in summer 1988.
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June 1989
The brothers looked dapper at a royal event in London in June 1989.
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September 1989
William and Harry were spotted sporting their school uniforms in fall 1989.
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April 1990
The brothers vacationed with their mom in the British Virgin Islands in the early 1990s.
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April 1991
William, Harry, and Diana went on a fun ski trip in Austria in spring 1991.
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October 1991
In fall 1991, the duo stepped out wearing matching denim outfits.
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October 1991
William, Harry, and their mother visited Niagara Falls in 1991.
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April 1993
The trio visited the Thorpe Park amusement part in spring 1993.
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March 1994
Diana and her boys bundled up in Austria in spring 1994.
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August 1995
Charles, Diana, William, and Harry at a V.J. Day commemorations event in summer 1995.
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September 1996
William and Harry looked handsome in matching suits in fall 1996.
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August 1997
William, Harry, and Charles visiting Balmoral Castle in summer '97.
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March 1998
Charles and his two sons were spotted skiing in Canada in 1998.
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December 1998
The boys attending Christmas church in Sandringham in 1998.
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June 1999
In summer 1999, William and Harry looked dapper at a royal family wedding.
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July 1999
The brothers again wore matching blue outfits in summer '99.
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April 2000
Charles posed with his boys in April 2000 during a ski trip in Switzerland.
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July 2001
In summer 2001, William and Harry attended a UK polo match.