Prince William steps out with Prince George and Princess Charlotte for Father's Day race

In celebration of Father's Day in the UK yesterday, Prince William spent the day with his two eldest children as they helped him kick off a half marathon event on the Queen Elizabeth's Sandringham Estate.

The Duke of Cambridge, who turns 39 today, was joined by Prince George, seven, and Princess Charlotte, six, at the beginning of the event.

Dressed casually in a pale blue shirt and a pair of navy chinos, the proud dad addressed runners and then held the microphone down to the two children so they could count down to the start of the race together.

Together the trio also cheered on all of the runners.

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Prince George echoed his father's style, dressed in a smart pair of blue chino shorts and a check shirt with navy Nike trainers.

Meanwhile, Charlotte wore a pair of denim shorts with bright pink Nike trainers, completing her look with a baby pink Ralph Lauren jumper.

Such a beautiful family!