He's 31 today! And what a life it's been. From his first day at nursery school, to his international exploits, to his iconic marriage to Kate Middleton, see photos of Prince William's finest moments.
Princess Diana holding her baby son, Prince William, at Kensington Palace.
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Prince Charles laughing with his sons as he lifts Harry onto William's shoulders in Kensington Palace.
Will on his first day at nursery school in September 1985. He arrived with Charles and Diana for his first day at Mrs. Mynor's Nursery School in Notting Hill, London.
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Philip, Charles, Diana and William (who is holding his hand over his eyes) as they stand on the balcony of Buckingham Palace for the Trooping the Colour ceremony in London in June 1988.
The Princess of Wales with her sons William and Harry on the chair lift during a skiing holiday in Lech, Austria, April 1991.
Prince William enjoys playing with the hound dogs at Badminton Horse Trials in May 1991 in Badminton, England.
The royal family watches the parade march past as part of the commemorations of Victory over Japan Day. The commemoration was held outside Buckingham Palace and was attended by 15,000 veterans and tens of thousands of spectators.
Diana greets her sons on the deck of the yacht Britannia in Toronto, when they joined their parents on an official visit to Canada in October 1991. The Princess is wearing a Moschino suit.
Prince William At Eton, the independent school for boys.
The Duke of Edinburgh, William, Earl Spencer, Harry and Charles walk outside Westminster Abbey during the funeral service for Diana, Princess of Wales. Hundreds of thousands of mourners lined the streets of Central London to watch the funeral procession. The Princess died in a car crash in Paris.
Prince William jokes with Marcela Hernandez-Rios, age 10, while teaching an English lesson to a classroom of Chilean schoolchildren during his Raleigh International expedition in December 2000 in the village of Tortel, Chile.
Britain's Prince William takes part in an exhibition Polo match in July 2001 at Cirencester Park Polo Club in Gloucestershire.
Harry and Will at the celebrations for Queen Elizabeth II's Golden Jubilee.
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Prince William plays with a rugby ball on the beach at St. Andrews in May 2003. At the time, the prince was two years into a four year History of Art degree at the Scottish university city.
Prince William attends the wedding of Ed Van Cutsem and Lady Tamara Grosvenor at Chester Cathedral in November 2004.
Prince William pauses in St. Salvator’s Quad at St. Andrews University. At the time, the prince was in the last year of his four-year course at the Scottish university.
Prince William takes part in an army training exercise, Winter Victory, at Paramali Village in Cyprus on in November 2006.
Britain's Prince William breaks into a smile as he is inspected by his grandmother, Queen Elizabeth II, during the Sovereign's Parade at The Royal Military Academy in Camberley in December 2006.
Harry, Will and Kate cheer on the English team during the RBS Six Nations Championship match between England and Italy in February 2007.
William, Harry and Harry's former girlfriend Chelsy Davy perform a Mexican wave at Wembley Stadium in north London in July 2007, as 60,000 revellers join the princes for the six-hour long extravaganza in memory of their late mother Diana. Will predicted it would be "an incredible night" of music after watching preparations being made for the event (which was timed for what would have been his mother's 46th birthday).
Prince William walks across the tarmac on his way to fly a Grob 115E light aircraft, known as the Tutor, while training at airbase RAF Cranwell, near Sleaford, Lincolnshire in January 2008. At the time, the 25 year-old prince was two weeks into a four-month attachment with the RAF to help him come to grips with the service's ethos, traditions and military role.
Will and Kate attend Harry Meade & Rosie Bradford's wedding at the Church of St. Peter and St. Paul in October 2010 near Cheltenham, England.
William and Kate arrive to pose for photographs in the State Apartments of St James Palace in November 2010. After much speculation, Clarence House finally announced the couple's engagement that day.
President Obama and First Lady Michelle Obama meet with Will and Kate at Buckingham Palace in May 2011 in London, England.
Will and Kate smile following their marriage at Westminster Abbey on April 29, 2011.
The newlyweds walk hand in hand from Buckingham Palace the day after their wedding to a waiting helicopter as they leave for a secret honeymoon location.
The Queen, Will, Kate and Jake Warren attend Investec Derby Day at Epsom Downs Racecourse in June 2011.
Will and Kate visit Victoria Barracks during a medal parade for the 1st Battalion Irish Guards Regiment in June 2011 in Windsor.
Prince William waves to the crowd as he attends the Order of the Garter procession and service at Windsor Castle in June 2011 in Windsor, England. The Order of the Garter is the oldest British Order of Chivalry, founded by Edward III in 1348. Membership in the order is limited to the sovereign, the Prince of Wales, and no more than twenty-four members.
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Will and Kate hug after taking part in a dragon boat race at Dalvay-by-the-Sea on day 5 of the royal couple's North American tour in July 2011 in Charlottetown, Prince Edward Island, Canada.
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Kate and Will arrive at the 2011 BAFTA Brits To Watch Event at the Belasco Theatre in July 2011 in Los Angeles, California. The newlywed Duke and Duchess of Cambridge were on the ninth day of their first joint overseas tour visiting Canada and the United States.
William dances with Vanessa Boateng as Kate looks on during a reception at Centrepoint's Camberwell Foyer in December 2011 in London. The national charity, Centrepoint, provides housing and support to improve the lives of homeless young people aged 16-25.
William and Kate attend the U.K. premiere of War Horse at Odeon Leicester Square in January 2012 in London.
William and Kate attend the 'Our Greatest Team Rises' Olympic concert at the Royal Albert Hall on May 2012 in London, England.
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Prince Will, Kate and Prince Harry wave as they pass the Houses of Parliament aboard the royal barge, 'Spirit of Chartwell' in London, on June 3, 2012, during the Thames Diamond Jubilee Pageant.
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Queen Elizabeth II, Prince Will, Kate and Prince Harry wave to the crowds from Buckingham Palace during the Diamond Jubilee carriage procession after the National Service of Thanksgiving at St.Paul’s Cathedral on the Mall on June 5, 2012 in London, England.
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Prince Will carries his dog Lupo at the Golden Metropolitan Polo Club Charity Cup polo match in June 2012 in Tetbury, England.
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Prince William stands next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, after they announced they were expecting their first child.
Prince William, the Duke Cambridge, spins the decks during a visit to the Quarriers Stopover Project, in Glasgow, Scotland, Thursday, April 4, 2013.
Prince William, Kate and brother Prince Harry raise their wands on the set used to depict Diagon Alley in the Harry Potter films during the Inauguration Of Warner Bros Studios in Leavesden, north London, on April 26, 2013.
Prince William and Kate, Duchess of Cambridge arrive for a service to celebrate the 60th anniversary of the coronation of Britain's Queen Elizabeth II at Westminster Abbey, London, Tuesday, June 4, 2013.
