The couple met on the set of the 2017 film Mary Shelley, in which Booth played Percy Shelley and Powley played Claire Clairmont, Mary’s stepsister.

Source: https://www.expressandstar.com/entertainment/showbiz/2023/11/03/bel-powley-and-douglas-booth-share-intimate-details-of-glitzy-london-wedding/

Then my stepsister opened her big mouth and told me to give the dress to her.

Source: https://slate.com/human-interest/2023/04/wedding-dress-fight-care-and-feeding.html?via=rss

What would this Cinderella story be without a wicked stepsister (or half-sister, in this case)?

Source: https://screenrant.com/my-happy-marriage-must-watch-netflix-anime/