Grenfell Tower Fire
The singer appeared during a virtual memorial service on the third anniversary of the London fire that claimed the lives of 72 people.
"I used to call you Meghan...," Williams began.
Kensington Palace announced the Duchess of Sussex's new collaboration on Monday.
Aside from politics, these were some of the worst events that happened in 2017.
WHAT'S HAPPENING
Aside from politics, these were the worst events that happened in 2017.
The singer and "Despicable Me 3" provided welcomed relief.
The Trump administration has been loosening health and safety regulations since Day One.