But while the Suits actress, 36, has now officially relocated to the United Kingdom and moved into Nottingham Cottage with Harry in the grounds of Kensington Palace, she was nowhere to be seen at the service last night.
Matt had a different reaction to the engagement news.
As an actor in Netflix's The Crown, Matt Smith depicts the life of a young Prince Philip and therefore has perhaps more knowledge than most about what royal life entails. "But hey, he's marrying the prince of Britain - how exciting for her", said Smith.
There's an interesting art-meets-life connection, in that the first season of "The Crown" dealt with the monarchy rejecting two royal marriages to divorced loved ones, and now Prince Harry is marrying divorcée Meghan Markle.
The actor, who plays Prince Philip on Netflix's royal period drama, spoke candidly about the pressures Markle will face during a panel yesterday (follow along above).
Meanwhile the Queen's suspicions of infidelity are aroused after she finds a picture of a dancer in his bag - believed to represent Pat Kirkwood, the real-life dancer he was once linked to.
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Apparently, Pornhub visitors also showed a little spike of interest in Ms. Markle when her and Harry first went public in November of previous year - with searches increasing by 1430 per cent.
The fictional Queen Elizabeth II said, "She's an actress, so there's hope for us all", during the same panel.
Pornhub reports that most royal searches are contained to parody characters - like Princess Leia and Princess Peach - but this royal announcement broke all their royal-search records, seeing huge increases in searches for Meghan from the US, UK, Spain, Germany and Belgium in particular.
'And they really have.
'And I think that's why the monarchy will survive and thrive, because it's willing to change and listen to the people and realize that some elements of the institution are outdated and unnecessary'.