They were last spotted together after the Duke of Edinburgh's service.
Here's where the Queen is living now.
He returned to America to be with his pregnant wife and son.
This will be her first birthday without Philip in over 70 years.
Ever wondered what Prince Philip looked like when he was younger? You already have an idea!
His marriage to the Queen influenced his royal role forever.
The courtship that started it all.
Rest in peace, Prince Philip.
The event came amid her eight-day mourning period for her husband.
Don't expect the usual royal fan fare during the Duke of Edinburgh's service.