Bridgerton Season 4 Cast & Character Guide: Sophie Baek, Araminta, Posy + Full Who’s Who 2026
Bridgerton Season 4 Cast & Character Guide: Sophie Baek, Araminta, Posy + Full Who’s Who
Last updated: January 31, 2026
Season 4 puts the spotlight on Benedict Bridgerton and the mysterious “Lady in Silver,” Sophie Baek. If you want a clean, spoiler-light guide to the biggest new characters (hello, Lady Araminta Gun and her daughters) plus every returning favorite—this is your “who’s who.”
Quick Season 4 context (no spoilers)
- Season 4 leads: Benedict Bridgerton and Sophie Baek.
- Release format: 8 episodes split into two parts.
- Vibe: a masquerade-ball “Cinderella” twist, with romance colliding into class rules and scandal.
New faces: Sophie Baek, Araminta, Rosamund & Posy
Sophie Baek (Yerin Ha)
Sophie is the season’s key newcomer—and the center of Benedict’s love story. She’s known to him first as a masked “Lady in Silver,” but behind the glamour is a young woman navigating survival, identity, and status. (If you read the books, this is the “Sophie Beckett” role—adapted for the show as Sophie Baek.)
Lady Araminta Gun (Katie Leung)
Araminta is the formidable society mother with two daughters debuting on the marriage mart—and a sharp instinct for social advantage. If you’re tracking the “Cinderella” parallels this season, Araminta is a name to remember.
Rosamund Li (Michelle Mao)
Rosamund is Araminta’s eldest daughter—polished, ambitious, and very aware of what a match can do for a family’s status. She’s not the type to quietly step aside once she decides what she wants.
Posy Li (Isabella Wei)
Posy is the younger Li sister, often described as kinder and more openly warm. In a season full of masks—literal and emotional—Posy’s straightforwardness can feel like a spotlight.
The Bridgerton family (returning)
- Benedict Bridgerton (Luke Thompson): Season 4’s romantic lead—artistic, restless, and suddenly obsessed with a mystery woman.
- Violet Bridgerton (Ruth Gemmell): the family’s match-making force of nature.
- Eloise Bridgerton (Claudia Jessie): sharp-tongued, curious, and increasingly unwilling to play by the Ton’s rules.
- Anthony Bridgerton (Jonathan Bailey): the Viscount—still steering family duty, even when love complicates everything.
- Kate Bridgerton (Simone Ashley): the Viscountess—grounded, observant, and not easily impressed by society theater.
- Colin Bridgerton (Luke Newton): newly married and adjusting to what “happily ever after” actually looks like day to day.
- Penelope Bridgerton (Nicola Coughlan): now a Bridgerton in public and a powerhouse with a pen.
- Francesca Stirling (Hannah Dodd): a newlywed still learning what her next chapter is meant to be.
- Hyacinth Bridgerton (Florence Hunt) & Gregory Bridgerton (Will Tilston): the youngest Bridgertons—watching, learning, and inching closer to their own big stories.
The Queen’s court & Ton power players
- Queen Charlotte (Golda Rosheuvel): society’s ultimate decider—she doesn’t just observe the Ton; she shapes it.
- Lady Danbury (Adjoa Andoh): wise, strategic, and always five moves ahead.
- Brimsley (Hugh Sachs): the Queen’s right hand, managing palace rhythms and court optics.
- Lady Whistledown (voice: Julie Andrews): the narration you hear even when characters wish they could escape it.
Featheringtons, Mondrichs & other returning storylines
- Portia Featherington (Polly Walker): relentless and practical—she can turn any mess into a plan.
- Mrs. Varley (Lorraine Ashbourne): Portia’s trusted fixer.
- Will Mondrich (Martins Imhangbe) & Alice Mondrich (Emma Naomi): building something real in a world that prefers appearances.
- Lord Marcus Anderson (Daniel Francis): a new(ish) presence in the romantic chessboard of the Ton.
- John Stirling (Victor Alli) & Michaela Stirling (Masali Baduza): important pieces in Francesca’s unfolding arc.
Full “Who’s Who” cast & character table
| Actor | Character | New/Returning | Quick character guide |
|---|---|---|---|
| Luke Thompson | Benedict Bridgerton | Returning (Lead) | Bohemian second son; romance takes center stage. |
| Yerin Ha | Sophie Baek | New (Lead) | “Lady in Silver” with a complicated double life. |
| Katie Leung | Lady Araminta Gun | New | Formidable society mother with daughters debuting this season. |
| Michelle Mao | Rosamund Li | New | Araminta’s eldest; ambitious, polished, competitive. |
| Isabella Wei | Posy Li | New | Araminta’s younger; warmer, talkative, kinder energy. |
| Ruth Gemmell | Violet Bridgerton | Returning | Family matriarch; matchmaking engine of the series. |
| Claudia Jessie | Eloise Bridgerton | Returning | Restless, witty, anti-convention—asks the questions others fear. |
| Jonathan Bailey | Anthony Bridgerton | Returning | The Viscount; duty-first with love now in the mix. |
| Simone Ashley | Kate Bridgerton | Returning | Viscountess; grounded, sharp, and protective of her family. |
| Nicola Coughlan | Penelope Bridgerton | Returning | Romance heroine turned Bridgerton; still tied to scandal and ink. |
| Luke Newton | Colin Bridgerton | Returning | Newly married; learning what partnership looks like beyond the chase. |
| Hannah Dodd | Francesca Stirling | Returning | Newlywed; quiet intensity with big emotions under the surface. |
| Victor Alli | John Stirling | Returning | Francesca’s husband; a calmer counterpoint in the Ton. |
| Masali Baduza | Michaela Stirling | Returning/Expanded | A new dynamic that adds tension and intrigue to Francesca’s arc. |
| Golda Rosheuvel | Queen Charlotte | Returning | Power, spectacle, control—society moves when she says so. |
| Adjoa Andoh | Lady Danbury | Returning | Mentor, strategist, truth-teller. |
| Hugh Sachs | Brimsley | Returning | Palace aide; quietly influential behind the scenes. |
| Julie Andrews | Lady Whistledown (voice) | Returning | The voice of the Ton’s most famous narrator. |
| Polly Walker | Portia Featherington | Returning | Survival-minded matriarch who never wastes a crisis. |
| Lorraine Ashbourne | Mrs. Varley | Returning | Portia’s right hand and problem-solver. |
| Martins Imhangbe | Will Mondrich | Returning | Working to build status and stability on his own terms. |
| Emma Naomi | Alice Mondrich | Returning | Smart, steady, and increasingly central to the Mondrich rise. |
| Daniel Francis | Lord Marcus Anderson | Returning | A romantic wildcard in the Ton’s social web. |
| Florence Hunt | Hyacinth Bridgerton | Returning | Younger Bridgerton; bold, curious, and observant. |
| Will Tilston | Gregory Bridgerton | Returning | Younger Bridgerton; growing up fast in a drama-filled world. |
What Reddit Theories Say About Sophie Baek, Araminta, and the Season 4 “mask” motif
No fandom does detective work like Reddit. From name-change deep dives to “who is hiding what” speculation, the conversation around Season 4 is especially loud because the entire premise hinges on mistaken identity and social disguise.
Meet Sophie: Yerin Ha Cast as Bridgerton Season 4 Lead
Reddit reactions to Part 1: first impressions without book spoilers
If you want live, in-the-moment reactions (and a thousand opinions on every look, line reading, and ballroom beat), the episode threads are where the party is.
Bridgerton - 4x01 "The Waltz" (No Book Spoilers)
FAQ
Who plays Sophie Baek in Bridgerton Season 4?
Yerin Ha plays Sophie Baek.
Who plays Lady Araminta in Bridgerton Season 4?
Katie Leung plays Lady Araminta Gun.
Who plays Posy in Bridgerton Season 4?
Isabella Wei plays Posy Li.
How many episodes are in Bridgerton Season 4?
Season 4 has 8 episodes, released in two parts.