Prince William, Prince George and Princess Charlotte Count Down Half Marathon Runners in Cute Moment

Prince William spent Father's Day with his and Kate Middleton's two eldest children, 7-year-old Prince George and 6-year-old Princess Charlotte, by kicking off a local half marathon! In addition to Father's Day, the Duke of Cambridge, who is also dad to 3-year-old son Louis, celebrated his 39th birthday on Monday. The back-to-back celebrations come after William's sister-in-law Meghan Markle revealed how she celebrated his brother, Harry, on his first Father's Day last year. In a new interview with NPR Weekend Edition, the Duchess of Sussex opened up about her new children's book, 'The Bench,' and the sentimental gift she gave her husband.