It was so "heartbreakingly good," former White House ethics chief Walter Shaub wrote.
The Sussexes and Cambridges were also joined by Queen Elizabeth II, Prince Charles and Camilla, Duchess of Cornwall.
Helen Mirren stars in "The Queen," a 2006 movie that now looks like a precursor to "The Crown."
Queen Elizabeth II announced a new agreement stating the Duke and Duchess of Sussex will no longer receive public funds for royal duties.
The queen released a personal statement saying she was pleased with the new arrangement.
"I wish I had a role model when I was younger. Maybe then I wouldn't have spent so much time feeling ashamed of my hearing loss."
“We respect and understand their wish,” Queen Elizabeth II said of Harry and Meghan's period of transition away from full-time royal life.
Harry and Meghan's announcement that they will step back from their royal roles came as a shock on Wednesday.
Queen Elizabeth II, Prince Charles, Prince William and Prince George appear in the picture that marks "the start of a new decade."
The monarch hails younger generations' "sense of purpose" in battling to protect "our environment and our climate."