How do we love Prince William? Let us count the ways. The Duke of Cambridge and future king of England turns 31 today, and he's been making plenty of headlines lately as the world awaits the birth of his firstborn. After Kate Middleton's many pregnant appearances this year, she's now out of the limelight as her due date approaches, and everyone's buzzing about the upcoming addition to the monarchy. 31 years ago, the world fell in love with Prince William when he was the royal baby, so to celebrate the soon-to-be dad's birthday, take a look at 31 reasons we can't get enough of Prince William!