Newly minted royal Kate Middleton rode through the streets of London in a carriage with Camilla Parker-Bowles and Prince Andrew, as part of the procession celebrating Queen Elizabeth II's birthday, a ceremony also known as Trooping the Colour.

Prince William, the Duke of Cambridge, had official duties in the parade, donning the same red Irish Guard uniform he wore to his Westminster Abbey wedding less than two months ago. The popular prince -- along with dad Prince Charles -- rode on horseback, saluting the Queen, for the festivities marking her 85th birthday.

The monarch's birthday is actually in April, but the outdoor celebration is traditionally scheduled for summertime when the weather is better. Next year, thousands in London will crowd the streets for an even bigger party when the Queen's "Diamond Jubilee" will mark her 60 years on the throne.

See more Trooping the Colour photos after the jump, including Kate's carriage ride with Camilla, and royals of all ages stepping onto the balcony of Buckingham Palace for a family photo.