British Royal Air Force Red Arrows pilots have performed a fly-past in London during the annual Trooping of the Colour ceremony.
The Queen's actual birthday is April 21.
The 92-year-old queen, who recently had a successful cataract operation, watched the ceremony from a dais and inspected the lines of guardsmen in bearskin hats and scarlet tunics who offered her tributes.
Queen Elizabeth followed in her own separate carriage while Prince William and Prince Charles rode on horseback because they are both royal colonels of the Household Division. His absence had nothing to do with his recent hip surgery.
Harry and Meghan looked at ease throughout the march, but at one point the Prince could be seen whispering to his wife. He will celebrate his 97th birthday Sunday.
Instagram princesseugenieShe shared the snap ahead of Father's Day this weekend reportedly very close to her father
"I know the Australian people will greet Their Royal Highnesses with great warmth and excitement wherever they go during their time here".
At 1pm, the royals gathered on the balcony for the RAF flypast featuring 23 modern and historic planes, Meghan taking centre stage.
Princess Kate, who has been on maternity leave since giving birth to Prince Louis, left the newborn home.
Meghan's choice of dress at the London church was in stark contrast to the other guests, who wore suit jackets and coats.
The blush-pink Carolina Herrera bardot-style top showed off perfectly Meghan's honeymoon tan, and complemented her Philip Treacy hat.
Camilla, Duchess of Cornwall, Catherine, Duchess of Cambridge and Meghan, Duchess of Sussex. While the Palace hasn't given any indication how Meghan will focus her charitable work, given her previous interest in women's empowerment, she may select a charity that benefits from her experience in this arena.
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The Trump administration's stance is a rare departure from the Justice Department's practice of defending federal laws in court. The lawsuit could easily go all the way to the Supreme Court before there is a resolution, which could take years.