Happy Birthday, William: Our 15 Favorite Moments as the Duke of Cambridge Turns 29

A one-day-old Prince William is carried by his parents out of St. Mary's Hospital, where he was born. The United Kingdom was thrilled to have a little heir to the throne.

A young Prince William poses in the gardens of Kensington Palace for his second birthday. Although he looks innocent in this picture, the prince was so misbehaved as a tot, he earned the nickname William the Terrible.

Prince William on his first day at Wetherby School in London. Of course, no first day of school would be complete without a big red lunchbox.

The eight-year-old Prince William visited Cardiff, Wales for his first official engagement. He toured Llandaff Cathedral, signed the guest book, posed for pictures, and graciously accepted gifts from his admirers.

At his mother's funeral, 15-year-old Prince William tries to keep a watchful eye on his younger brother Harry, who was 12.

When the Prince represented Scotland in a water polo tournament, all attention was on his choice of bathing suit.

Prince William graduated from St. Andrew's University with a master of arts degree in geography. Even the Queen was there to see her grandson receive his diploma.

How can we not include a picture of the Prince on his beautiful white horse? The Prince is a notable polo player, having learned to ride almost as soon as he could walk.

The Princes organized a massive concert to celebrate the life of their mother, Diana, Princess of Wales. It was no small feat, with performances from stars like Sir Elton John, Rod Stewart and Fergie.

Prince William has a well-documented social life. He and Kate Middleton (now Catherine, Duchess of Cambridge) have been photographed partying at London hotspots such as Boujis and Mahiki. Of course, they always try to sneak out the back door.

At Windsor Castle, Prince William became the 1000th person to be inducted into the Order of the Garter, the highest order of chivalry in England. Kate Middleton attended the ceremony and couldn't help but laugh at her then-boyfriend's traditional robes.

William and a six-man crew spotted a suspicious speedboat in the seas northeast of Barbados. When they boarded the boat, they discovered $80 million worth of cocaine. William (26), who was trying out the Royal Navy for two months, came home a hero.

Prince William stirred controversy when he landed a multi-million pound helicopter in Kate Middleton's backyard. The Prince was in Royal Air Force Training and clearly wanted to show off his new moves.

William and Harry visited the Semongkong Children's Centre on their trip to South Africa; they traveled to the country to visit projects supported by their charities.

This picture needs no caption. Just shy of his 29th birthday, the Prince kisses his new bride — twice — in front of the whole world.