And it was a question that made the royal blush!
"If you're first up you have to be more formal on such an occasion", explained Thompson. You can choose to say, 'Well, of course we don't have an empire anymore, thank God, because it was ghastly, colonial, racist, dreadful, dreadful undertaking on every level, ' and actually have some moral principle about it.
She said: "I'd like to inspire others and empower others to believe in themselves, especially people with Down's syndrome".
Yet despite her successful career, the actress confessed to feeling shy around Prince William revealing: "I love Prince William. I'm going, 'why isn't this top of the list?' We have kids begging in schools for leftover food, that's just very bad".
That's right, Thompson saved herself from wearing a pair of fancy heels that surely would have distracted her during her big moment with Prince William.
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Thompson has always been a friend of Prince Charles and his boys.
Thompson, who carried on her famously relaxed take on life by teaming her navy Stella McCartney suit with white trainers to the ceremony, has also previously spoken about what it's like to dance with Prince Charles. "I'm sorry, but that's just rubbish".
In June, the Thompson was named for the honor among a group of British actors and artists, including Tom Hardy and Keira Knightley, but revealed she had some reservations about the historical implications about accepting the award.
Congratulations, Dame Emma! We wouldn't have you any other way!