The British Royal Family celebrates Prince Philip's 90th birthday.

Queen Elizabeth, Prince Philip and the Dean of Windsor, June 12th, 2011.

Prince Philip, Duke of Edinburgh, celebrated his 90th birthday today. This morning there was a service at St. George's Chapel (the place of worship at Windsor Castle) to honour Prince Philip's service to Great-Britain and the Queen. Of course, the day wouldn't have been complete without the entire royal family present,

Prince Harry and the Duke and Duchess of Cambridge arrive at the service.

including Britain's favourite couple, the Duke and Duchess of Cambridge, aka William and Kate, as well as royal bad boy Prince Harry.

Unfortunately the weather was very British this morning, meaning that it rained. Fortunately that gives us a really nice snapshot of William holding an umbrella up so that Kate's outfit ( a blue brocade frock and nude LK Bennett pumps) & hair won't get ruined. Harry doesn't really seem to care.

After the service a canapé-and-drinks reception followed at the Grand Reception Room of St. George's Hall, on the grounds of Windsor Castle. There were 750 guests in attendance, among the royal guests were Prince Charles and his wife Camilla, Duchess of Cornwall, the Duke of York and the Earl of Wessex (aka Prince Andrew, second son of Queen Elizabeth and Prince Philip, and Prince Edward, their third son), the Princess Royal (Princess Anne, the royal couple's only daughter), Princesses Eugenie and Beatrice and Zara Philips.
                                                                                         

The Duke and Duchess of Cambridge with the Dean of Windsor.

The reception wasn't the end of the festivities for the royal family, as they also had a private lunch with Prince Philip's wider family, including King Constantine of Greece and royalty from Germany and Jordan.

It was quite the weekend for Kate, as she attended the Trooping of the Colour with the royal family yesterday and then attended the wedding of friends Sam Waley-Cohen and Annabel Ballin with sister Pippa, making today her third public appearance in two days.