Ever watched a TV show and wondered if the actors playing siblings are actually related? For fans of BBC Three’s dark comedy Such Brave Girls, that question comes up a lot—because the actresses, Kat Sadler and Lizzie Davidson, really are sisters in real life. This article clears up the confusion around their relationship, explains why they have different surnames, and takes a closer look at what each of them is known for.
Date of birth: Not publicly available ·
Notable role: Josie in Such Brave Girls (BBC Three) ·
Sister in show: Kat Sadler (plays Billie) ·
Real-life relation: Sisters ·
Other known work: Death in Paradise, Mitchell and Webb Are Not Helping ·
Social media: Instagram @lizziedavidsonx (10K+ followers)
Quick snapshot
- Lizzie Davidson and Kat Sadler are real-life sisters (Wikipedia biographical reference)
- They play sisters Josie and Billie on Such Brave Girls (Wikipedia show description)
- Kat Sadler uses a stage name; Davidson is the family surname (IMDb production details)
- Lizzie Davidson’s exact date of birth
- Kat Sadler’s personal relationship history beyond rumors
- Whether the actresses are close friends outside of work
- Such Brave Girls season 2 released July 2025 on BBC Three and iPlayer (BBC News entertainment coverage)
- The pair were jointly featured in a 2025 featurette for season 2 (Paste Magazine interview)
- Further seasons of Such Brave Girls likely if ratings hold
- Lizzie Davidson may appear in more BBC comedy/drama projects
- Kat Sadler’s writing career continues to grow
| Label | Value |
|---|---|
| Full name | Lizzie Davidson |
| Profession | Actress |
| Notable work | Such Brave Girls (2023–present) |
| Other TV appearances | Death in Paradise, Mitchell and Webb Are Not Helping |
| Social media | Instagram @lizziedavidsonx (10K+), X @lizziedavidsonx |
Are Lizzie Davidson and Kat Sadler Sisters?
The relationship between the Such Brave Girls co-stars
- Kat Sadler and Lizzie Davidson are real-life sisters, as confirmed by multiple sources including Wikipedia biographical entry and BBC News entertainment feature.
- They play sisters Josie and Billie on the show, making the casting especially authentic. Hot Press culture magazine notes the series features Kat’s real-life sister as her on-screen sibling.
- Stylist women’s lifestyle publication also confirms the pair worked together as sisters on the BBC series.
Why fans ask this question
- Their on-screen chemistry is so natural that many viewers assume it must be acting—but the closeness comes from a real sibling bond.
- Because Kat Sadler uses a stage surname, casual fans don’t immediately connect the two as family.
Bottom line: Lizzie Davidson and Kat Sadler are sisters—both in real life and on Such Brave Girls. The casting of actual siblings gives the show’s family dynamic an added layer of authenticity, a choice that distinguishes the series from typical sitcom casting.
Why Do Kat Sadler and Lizzie Davidson Have Different Surnames?
Surname differences explained
- Kat Sadler’s family name is Davidson; “Sadler” is her professional stage name. This is documented on IMDb production credits, which lists her birth surname as Davidson.
- Lizzie Davidson uses the family surname, so the difference is simply a matter of one sister choosing a stage name.
Common misconceptions about family names
- Some fans speculate that one sister may have married and changed her name, but there is no evidence of marriage for either regarding the surname difference.
- Others wonder if they are half-sisters, but multiple sources confirm they are full sisters—no half‑sibling distinction has ever been reported.
The different surnames trip up even dedicated viewers, but the explanation is simple: Kat Sadler uses an alias professionally, while Lizzie Davidson keeps the family name. No marriage, no separation—just a common industry choice that often confuses audiences.
What Is Lizzie Davidson Known For?
Her role in Such Brave Girls
- Lizzie Davidson plays Josie, one half of the dysfunctional sister duo at the heart of the BBC Three sitcom. The show, described by BBC News entertainment desk as a “dark comedy inspired by a bleak dating scene,” follows Josie, Billie, and their single mother Deb.
Other TV credits
- She appeared in the long-running crime drama Death in Paradise (2011), as noted on Wikipedia Kat Sadler page which lists her sister’s credits.
- More recently, Davidson featured in Mitchell and Webb Are Not Helping (2025), a comedy series from the established British duo.
Awards and recognition
- While the show itself has won awards (BAFTA for Scripted Comedy in 2024), Davidson’s individual award history is not publicly detailed.
The pattern: Lizzie Davidson is best known for a single standout role, but her career spans over a decade across BBC drama and comedy. The implication is that her sister’s writing has opened doors for her to showcase a wider range.
Are Billie and Josie Sisters in Real Life?
Fictional vs real relationships
- Billie and Josie are characters played by Kat Sadler and Lizzie Davidson. As established, the actresses are real sisters, so the on-screen relationship mirrors reality.
- The show’s creator, Kat Sadler, wrote the parts with her own family in mind. BBC News entertainment feature described the series as following “sisters Josie and Billie, along with their mum Deb.”
Casting decisions for Such Brave Girls
- Kat Sadler told The Times (via Wikipedia) that she wanted her sister Lizzie to read the script; Lizzie then became involved naturally. Wikipedia such Brave Girls documents this origin.
Because the actresses are genuinely close, some viewers mistakenly think the entire show is a documentary. The dark humor and deadpan delivery blur the line—but it’s a fictional sitcom, not a reality show. The result is a rare case where life imitates art almost perfectly.
What Mental Illness Did Lizzie Have in The Walking Dead?
Clarifying a different Lizzie
- This query refers to Lizzie Samuels, a character from AMC’s The Walking Dead, not actress Lizzie Davidson. Lizzie Samuels suffered from a trauma-related psychological condition brought on by the apocalyptic setting.
- Lizzie Davidson has never appeared on The Walking Dead—the confusion stems from the shared first name.
Separating characters across shows
- Lizzie Davidson’s credits are entirely in British comedy and light drama; the Walking Dead character is a unrelated television role.
Who Is Kat Sadler’s Ex-Husband?
Kat Sadler’s personal life
- Kat Sadler (the British writer/actress) is not the same person as Catt Sadler, the American television host who was married to Kyle Boyd. The similar names cause frequent confusion.
- Kat Sadler’s marital history is not widely reported; she keeps her personal life private.
Misattributions due to name confusion
- Online searches for “Kat Sadler ex-husband” often return results about Catt Sadler’s marriage. The two are unrelated.
Why this matters: When researching the Such Brave Girls cast, it’s important to distinguish between the British comedian Kat Sadler and the U.S. entertainment journalist Catt Sadler—they are separate people with separate lives. The pattern here is that name similarity alone generates persistent search confusion across two entirely separate careers.
Comparison: Lizzie Davidson vs Kat Sadler
Two actresses, one shared surname in private, one shared show—but their career paths differ. Here’s how they stack up.
| Aspect | Lizzie Davidson | Kat Sadler |
|---|---|---|
| Role in Such Brave Girls | Josie (younger sister) | Billie (older sister) |
| Primary profession | Actress | Writer / Actress / Creator |
| Stage name? | Uses family name | Uses stage surname (Sadler) |
| Other notable work | Death in Paradise, Mitchell and Webb Are Not Helping | Created Such Brave Girls |
| Awards won | – (show won BAFTA 2024) | BAFTA 2024 for Scripted Comedy (as creator) |
The trade-off: Kat Sadler is the public face of the show—the writer and lead—while Lizzie Davidson excels as a character actress. Together they form a creative unit that audiences find hard to separate. What this means is their individual strengths complement each other, producing a on-screen dynamic that few acting duos can replicate.
Quotes from the cast and press
“Such Brave Girls is a dark comedy inspired by a bleak dating scene… [it follows] sisters Josie and Billie, along with their mum Deb.”
— BBC News entertainment feature
“The series features Kat Sadler’s real-life sister Lizzie Davidson as her sibling Billie.”
“Kat Sadler worked with her sister on the BBC series Such Brave Girls.”
“Kat Sadler’s family name is Davidson; Sadler is her stage name.”
For fans wondering whether the sibling dynamic is real, the answer is a clear yes. The confusion about surnames and personal lives stems largely from Kat’s stage name and the inevitable internet conflation with a different celebrity. What remains is a funny, heartfelt show built on a genuine family bond—and that’s exactly why it works. For Lizzie Davidson, this real-life connection has become the defining feature of her public identity as an actress.
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Readers interested in learning more about the creative force behind Such Brave Girls might explore Kat Sadlers full biography for insights into her career and accolades.
Frequently asked questions
Are Lizzie Davidson and Kat Sadler the same person?
No. Lizzie Davidson is Kat Sadler’s younger sister; they are two different people who often appear together in promotional material.
What is Such Brave Girls about?
It’s a BBC Three dark comedy about two dysfunctional sisters and their single mother, inspired by creator Kat Sadler’s own experiences.
Who wrote Such Brave Girls?
The series was created and written by Kat Sadler.
How many series of Such Brave Girls are there?
As of mid-2025, two series have been released. Season 2 dropped in July 2025.
Is Kat Sadler related to Catt Sadler?
No. Kat Sadler is a British comedian; Catt Sadler is an American TV host. They are not related and the name similarity is coincidental.
Where can I watch Such Brave Girls?
The show is available on BBC Three and BBC iPlayer in the UK, and on Hulu in the US.
Has Lizzie Davidson won any awards?
She shares in the show’s BAFTA 2024 win for Scripted Comedy, but individual awards have not been reported.
What is Lizzie Davidson’s Instagram handle?
Her Instagram account is @lizziedavidsonx.
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Richard Vane is Senior Reporter at MorningTimes.uk, covering breaking UK news stories across politics, business and public affairs.