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Prince William, Kate Celebrate the Queen

Prince William and Kate Middleton

It's a royal birthday like none other!

Prince William and his bride, Princess Kate, joined the rest of their royal family members to fete Queen Elizabeth II's 85th birthday Saturday in central London.

PHOTOS: William and Kate's most romantic moments

Clad in his official wedding uniform, William, 28, escorted his bride — who wore a double-breasted cream jacket and black hat — as she attended her first ceremonial event as the Duchess of Cambridge. See more photos from the Queen's birthday party.

As William rode on horseback in the military parade, his bride waved to her adoring fans while sitting in a carriage with Prince Harry, Prince Andrew and Prince Charles' wife, Camilla.

Related: PHOTOS: How Kate got ready for her royal life

Saturday's Trooping the Colour military parade marked the first time the entire royal family has gathered in front of the public en masse since William and Kate's April 29 nuptials.

Although the Queen's actual birthday was on April 21, the summer parade serves as her day of official celebration, since the warmer temperatures make it easier to hold an outdoor event. The Queen's husband, Prince Phillip, turned 90-years-old on Friday.

VIDEO: Highlights of the royal wedding

After Saturday's parade, the royals gathered to watch the tradtional flypast on the very same Buckingham Palace balcony where William and Kate shared their first kiss as husband and wife six weeks ago.

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