It's an extra special Father's Day for Prince William this year, as the first one with both his children also happens to fall on his birthday.  The prince turns 33 years old today. The popular royal is set to mark the happy occasion at home with his wife, Catherine, The Duchess of Cambridge and their two children, Prince George and Princess Charlotte. Last year, for his first Father's Day, William took part in a charity polo match with wife Kate and young George also in attendance. This year, the couple's second child Charlotte will make the day extra special. Princess Charlotte made her arrival into the world on May 2nd, 2015, while George will celebrate his second birthday on July 22nd. The last public outing for the family was last Sunday, June 14th, for another charity polo event. The match came just one day after the Trooping of the Colour, where the cherub-like George received a warm welcome from the crowds. Princess Charlotte has largely been kept out of the public eye since her very recent arrival, but if her big brother is anything to go by it seems like she'll be a natural in the spotlight too...