"I'm very outspoken politically", said the 59-year-old, adding that she hoped to use her damehood to bring attention to so-called "holiday hunger", which sees up to three million United Kingdom children go hungry during the school holidays.
Even a ceremony as grand as receiving a damehood couldn't stifle Emma Thompson's quick wit.
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But the "Love Actually" star evidently didn't take the rejection too personally, noting that the Prince is "looking wonderful and doing so well".
E! News said Thompson joked with William as as he presented her with the honor. "You can choose to say, 'Well, of course we don't have an empire anymore, thank God, because it was ghastly, colonial, racist, awful undertaking on every level, ' and actually have some moral principle about it", Thompson said on "Late Night with Seth Meyers" in September.
Outside the palace, Thompson smiled and stood next to her husband Greg and two children, Gaia and Tindyebwa.
Dressed in a navy Stella McCartney suit and white sneakers, Thompson also wore a Fawcett Society Equal Pay button, telling the press she hopes to use her damehood to help stop children from going hungry over the school holidays.