L-R: Michelle Mao as Rosamund Li, Katie Leung as Lady Araminta Gun, Isabella Wei as Posy Li in 'Bridgerton' Season 4 Liam Daniel/Netflix SPOILER ALERT: This piece spoils Part 1 of Bridgerton Season 4. Harry Potter star Katie Leung took on the layered role of Araminta Gunn (Formerly Li), who fulfills the evils stepmother trope of Sophie Baek’s (Yerin Ha) Cinderella-like love story with Benedict Bridgerton (Luke Thompson) in Season 4 of Bridgerton, based on Julia Quinn’s novel An Offer From a Gentleman. Formerly married to Viscount Li, with whom she had two daughters — Michelle Mao’s Rosamund Li and Isabella Wei’s Posy Li — Araminta wasn’t always the bitter woman who makes Sophie do endless chores like polishing her many pairs of shoes or loading her with tasks that require more than just one housemaid.