Her Majesty travels by carriage from Buckingham Palace to the Horse Guards Parade across St. James's Park to inspect her personal troops - and the Royal Family always comes out in full force to help her celebrate.
Watched by large crowds, the newlyweds arrived in a horse-drawn carriage as part of a procession.
Arguably the cutest moment from the celebration came when 4-year-old Prince George began giggling, and found himself shushed by 7-year-old cousin Savannah Phillips, granddaughter of Princess Anne.
She was without her husband Prince Philip for the day, after the Duke of Edinburgh retired from official duties.
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Though it's not the first time Meghan has donned the tilted accessory, as she previously wore the powder pink hat at Prince Charles' 70th birthday celebrations with a sheer dress by London-based label Goat.
Her husband, the Duke of Edinburgh, attended the event with her a year ago, but was absent today.
Only royal colonels ride during the Queen's annual birthday parade.
That Kate and Queen trip to Leicester came almost a year after her marriage to Prince William. The Duchess made sure to have her own style stand out while attending her very first Trooping the Colour parade.
Chris Jackson/Getty ImagesIT'S HER PARTYThe Queen's actual birthday was April 21. Meghan's already looking fully at ease. laughing and smiling with her father-in-law and Kate.
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There were a few hiccups, as expected for someone still learning what it means to be a royal in appearance and attitude.
"Prince William and Prince Charles are royal colonels, which is a position given by the Queen to a member of the royal family that serves as Colonel-in-Chief of a regiment in the British army or navy".
Meghan also had her hair styled in a bouncy blowout.
"Both of us have passions for wanting to make change, change for good, and, you know, with lots of young people running around the commonwealth, that's where we'll spend most of our time hopefully", Harry said shortly after the couple's engagement was announced in November.
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