How's this for pomp and circumstance!
Cloaked in navy velvet capes and elegant hats, all three generations wore the traditional garb for the annual ceremony.
Noticeably absent was Kate Middleton, who made her last public appearance just a few days ago as she prepares for her baby's arrival.
On Saturday, the Duchess of Cambridge attended the Queen's birthday party in a stunning pale pink Alexander McQueen coat and Jane Corbett hat.
Middleton had that mommy-to-be pregnancy glow about her as she was driven to the special occasion.
Prince William later joined his wife and the rest of the royals on the balcony of Buckingham Palace to watch the Royal Air Force's fly-past, wearing his ceremonial Colonel of the Irish Guards uniform.
It shouldn't be long before the royal baby is finally here!