The 94-year-old monarch decided to announce that she had gotten the jab.
Prince William accompanied his grandmother for the rare joint appearance.
The princess remodeled a gorgeous gown previously worn by her grandmother, Queen Elizabeth.
Her Majesty has shown up virtually in video calls and pictures. But the pandemic is still keeping her away from in-person events.
The Duke and Duchess of Sussex tied the knot at Windsor Castle on May 19, 2018.
This is only the fifth time the monarch has given a special address to the nation.
The monarch hails younger generations' "sense of purpose" in battling to protect "our environment and our climate."
The Duke of Sussex and the famed primatologist adorably go ape with each other at an event for young conservationists.
Newlyweds release four official photos from their big day.
The model broke with tradition and did her own thing.