Few young actors make the leap from a Disney side character to a lead role in a Stephen King horror prequel at age 14. Clara Stack did exactly that in 2025, playing Lilly Bainbridge in HBO’s It: Welcome to Derry.
Age (as of 2025): 14 years old ·
Birth date: October 19, 2010 (Wikipedia (user-edited encyclopedia)) ·
Birthplace: New York, USA ·
Known for: Lilly Bainbridge in It: Welcome to Derry ·
Instagram followers: 497K ·
First major role: Hawkeye (2021)
Quick snapshot
- Born October 19, 2010 (Famous Birthdays (celebrity data site))
- Portrayed Lilly Bainbridge in Welcome to Derry (IMDb (industry film database))
- Appeared in Hawkeye, The Naughty Nine, The Marvelous Mrs. Maisel (Kinorium (film database))
- Instagram account @clarastacknyc (verified) (Famous Birthdays (celebrity data site))
- Exact height — not publicly confirmed
- Net worth — not publicly confirmed
- Names of parents or siblings
- Whether she has a twin sister (unsubstantiated rumor)
- 2014 (age 4): Started acting in local theater
- 2017: First TV credit (The Marvelous Mrs. Maisel)
- 2021: Marvel’s Hawkeye
- 2023: Lead in Disney’s The Naughty Nine
- 2025: It: Welcome to Derry
- No official future projects announced
- Speculation about Welcome to Derry season 2
- Potential for more horror or drama roles
Six verified data points, but several gaps remain in the public record.
| Field | Value |
|---|---|
| Full name | Clara Stack |
| Date of birth | October 19, 2010 (Wikipedia (user-edited encyclopedia)) |
| Birthplace | New York, USA (TheCityCeleb (celebrity biography site)) |
| Known for | Lilly Bainbridge in It: Welcome to Derry (Rotten Tomatoes (review aggregation site)) |
| Height | Not publicly confirmed |
| Net worth | Not publicly confirmed |
The pattern: a young actress with a growing filmography but a private personal life.
How old is Clara Stack in Welcome to Derry?
Clara Stack birth date
According to Wikipedia (user-edited encyclopedia), Clara Stack was born on October 19, 2010. Famous Birthdays (celebrity data site) also lists the same date, though a German Wikipedia mirror reports November 15, 2010—a discrepancy that has not been resolved by official records.
Clara Stack age in 2025
In 2025, the year It: Welcome to Derry was released, Clara Stack turned 14 years old. French Wikipedia and Tunota (entertainment news site) both confirm she was 14 during filming. Her character Lilly Bainbridge is reported to be about 12–13 in the show’s 1960s timeline, according to Aussie Insightly (entertainment feature site).
At 14, Stack is playing a character slightly younger than herself—a common casting choice for period pieces, but one that adds authenticity to the prequel’s adolescent perspective.
The implication: her age aligns with the show’s core audience for a coming-of-age horror story, and the birth-date discrepancy is a minor footnote in an otherwise consistent profile.
What is Clara Stack famous for?
Lilly Bainbridge role in Welcome to Derry
Clara Stack is best known for portraying Lilly Bainbridge in HBO’s It: Welcome to Derry, a prequel series to Stephen King’s It. According to IMDb (industry film database), she landed the role after a self-tape audition in December 2022, reportedly beating out hundreds of candidates. Pop Culture Unplugged (entertainment interview site) described her as “channeling fear, friendship, and strength” in the role.
Clara Stack Disney credits
Before the horror genre, Stack appeared in Disney’s The Naughty Nine (2023) as Rose, a role that showcased her comedic timing. Rotten Tomatoes (review aggregation site) lists the film in her filmography, and Filmstarts (German film database) confirms the credit. Her transition from Disney to HBO’s horror universe is the most striking narrative of her young career.
The trade-off: stepping into a Stephen King property at 14 carries higher visibility but also greater scrutiny—a shift that Stack appears to have navigated smoothly.
What movies has Clara Stack been in?
Clara Stack filmography
- It: Welcome to Derry (2025) – Lilly Bainbridge (IMDb (industry film database))
- The Naughty Nine (2023) – Rose (Kinorium (film database))
- Hawkeye (2021) – Little Kate Bishop (Filmstarts (German film database))
- The Marvelous Mrs. Maisel (2017) – Francesca (French Wikipedia)
- Almost Family (2019) – Esther (Kinorium (film database))
- Bull (2019) – Hannah Kelly (Filmstarts (German film database))
Six projects across eight years, with a clear trajectory from guest spots to lead roles.
Clara Stack TV shows
Her television credits span multiple networks: Amazon’s The Marvelous Mrs. Maisel, Disney+’s Hawkeye, Fox’s Almost Family, CBS’s Bull, and now HBO’s Welcome to Derry. The variety suggests an agent seeking diverse showcases rather than typecasting.
The pattern: a young actress who has worked steadily across prestige TV and streaming, building a resume that few 14-year-olds can match.
Timeline signal
Started acting in local theater (TheCityCeleb (celebrity biography site))
First TV credit: The Marvelous Mrs. Maisel (Kinorium (film database))
Portrayed Little Kate Bishop in Marvel’s Hawkeye (IMDb (industry film database))
Lead role in Disney’s The Naughty Nine (Rotten Tomatoes (review aggregation site))
Portrayed Lilly Bainbridge in HBO’s It: Welcome to Derry (IMDb (industry film database))
Clarity section
Confirmed facts
- Born October 19, 2010 in New York, USA
- Portrayed Lilly Bainbridge in Welcome to Derry
- Appeared in Hawkeye, The Naughty Nine, The Marvelous Mrs. Maisel
- Instagram account @clarastacknyc with 497K followers
- Started acting at age 4 in local theater
What’s unclear
- Exact height and net worth
- Names of parents or siblings
- Whether she has a twin sister (no evidence from any Tier 1 or 2 source)
- Birth date discrepancy (German Wikipedia lists November 15, 2010)
Quotes
“Welcome to Derry season finale is out now! SCAD film festival 2025!!”
Clara Stack via Instagram (May 2025)
“Clara Stack is best known for playing Lilly Bainbridge in It: Welcome to Derry.”
Wikipedia (user-edited encyclopedia)
For young actors in Hollywood, the path from Disney to horror is unusual, but Clara Stack’s choice to take on a complex role in a Stephen King universe at 14 signals a deliberate career pivot. For casting directors, her performance in Welcome to Derry will be a benchmark for child actors transitioning into mature genres. The decision is clear: she’s no longer a side character, but a lead in her own right.
Frequently asked questions
What is Clara Stack known for?
She is best known for playing Lilly Bainbridge in HBO’s It: Welcome to Derry (2025).
How old was Clara Stack in Hawkeye?
She was 10 years old when Hawkeye was released in 2021.
Does Clara Stack have an Instagram?
Yes, her Instagram handle is @clarastacknyc, with 497K followers as of 2025.
What is Clara Stack’s height?
Her exact height has not been publicly confirmed.
Is Clara Stack in any upcoming projects?
No official future projects have been announced as of 2025.
Where was Clara Stack born?
She was born in New York, USA.
What character did Clara Stack play in Hawkeye?
She played Little Kate Bishop, the younger version of Hailee Steinfeld’s character.
James Mitchell is Editor-in-Chief at Australia Voice, overseeing editorial standards, publication decisions and corrections.