Prince William Turns the Big 3-0

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It's Prince William's big day, turning 30-years-old on June 21, but the popular royal - second heir to the throne - will spend his birthday having a low-key celebration with his new wife.

The Palace says Wills will spend his milestone birthday in private with the Duchess of Cambridge and likely some close friends.

Prince William is set to inherit approximately 10 million pounds - the equivalent of $16 million - to mark his 30th birthday, under the terms of his late mother, Princess Diana's will.

To help celebrate William's big 3-0, we've got a gallery of the 30 biggest moments from the prince's 30th year of life! Of course, these include his Royal Tour of Canada and numerous public appearances as a newlywed, plus of course his grandmother, Queen Elizabeth II's Diamond Jubilee celebrations.