Clara Stack: Age, Career, and Welcome to Derry Facts

A small guest role on Marvel’s Hawkeye turned into a starring gig on HBO’s Welcome to Derry for Clara Stack — in just four years. The 14-year-old actress now leads the Stephen King prequel as Lilly Bainbridge, making her one of the youngest actors to anchor a major horror franchise.

Born: October 19, 2010 (age 14) ·
Instagram followers: 504K ·
TikTok followers: 569.3K ·
Known for: It: Welcome to Derry, Hawkeye

How old is Clara Stack in real life?

Clara Stack was born on October 19, 2010, making her 14 years old as of 2025. This date is consistently reported across entertainment databases and biography aggregators including TV Insider and Famous Birthdays. A 2026 profile from TV Insider lists her as 15 years old, which aligns with the October 19, 2010 birth date — confirming the math works.

How old is Clara Stack in Welcome to Derry?

Lilly Bainbridge, her character in Welcome to Derry, is also likely around 13-14 years old based on the show’s timeline as a prequel set in the 1960s. The production has not officially confirmed the character’s exact age, but Stack’s real age lines up naturally with the young ensemble cast that includes Matilda Lawler and Amanda Christine.

What is Clara Stack’s birth date?

Her full birth date — October 19, 2010 — is confirmed by multiple sources. That makes her a Libra (born September 23–October 22) in terms of zodiac sign, though this has not been mentioned in any official biography. The Jenna Ortega biography similarly tracks young actresses whose roles outpace their years — a pattern that Stack is now following.

The pattern: Stack entered the industry with guest roles at age 11 and, within four years, earned a lead in a premium cable series. That’s roughly half the time it takes most child actors to make the jump from background to lead.

What is Clara Stack famous for?

Clara Stack’s breakout role is Lilly Bainbridge in HBO’s It: Welcome to Derry (2025), a prequel series to the It franchise. The show premiered on HBO Max and features Stack in all eight episodes of the first season, according to the IMDb full cast page. But her path to this role started earlier, with two notable earlier credits.

Her filmography shows a steady climb in role size and platform prestige:

Three credits in four years, each one a step up in visibility. Her IMDb profile describes her as “known for It: Welcome to Derry (2025), The Naughty Nine (2023), and Hawkeye (2021).”

What movies has Clara Stack been in?

So far, her filmography is television-focused. The Naughty Nine (2023) is her only feature-length movie to date — a Disney Channel original film where she held a lead role. She has not yet appeared in theatrical films, though her agents have not commented on upcoming projects. An interview with Pop Culture Unplugged notes that she auditioned for Welcome to Derry in December 2022 via self-tape and was offered the role roughly two months later.

What TV shows has Clara Stack appeared in?

• Madam Secretary (CBS) — guest appearance, year unconfirmed
• Bull (CBS) — guest appearance, year unconfirmed
• Hawkeye (Disney+) — 1 episode, 2021
• It: Welcome to Derry (HBO) — 8 episodes, 2025

These credits come from the Famous Birthdays profile, which mentions she “appeared in television series including Madam Secretary, Bull and Hawkeye.” The exact episode counts for the CBS shows have not been confirmed in any verified source.

What this means: Stack’s career trajectory — from one-episode guest spots to a series regular on a major HBO production — follows the classic child actor arc, but compressed into a shorter timeline than most. The casting team behind Welcome to Derry saw something in her self-tape that led to a lead role within two months.

What ethnicity is Clara Stack?

Clara Stack’s ethnicity has not been publicly confirmed. Neither Stack nor her representatives have issued any official statement about her ethnic background. She is American by nationality, according to TV Insider, but her ancestry, cultural heritage, and family origins remain undisclosed.

This is not unusual for a child actress — many young performers do not publicly discuss ethnicity or family background until they reach adulthood or until casting profiles require it. The absence of information has led to some online speculation, but no reliable source has provided confirmation on this detail.

The catch: Without an official biography or interview covering her background, any claim about her ethnicity is speculation. The Stephen King Wiki does not address ethnicity, and no news outlet has published a verified report on the topic.

Does Clara Stack have a twin sister?

No. According to available information, there is no reliable evidence that Clara Stack has a twin sister. The question appears to arise from confusion with another actress or with a fictional character — possibly a character in Welcome to Derry or elsewhere. None of the established sources — TV Insider, IMDb, Famous Birthdays — mention any sibling, twin or otherwise.

This rumor may stem from a false connection to the It franchise, where twin characters appear in Stephen King’s source material. But Stack’s character Lilly Bainbridge is not a twin, and Stack herself has not referenced a sibling in any known interview or social media post.

Why this matters: Misattribution like this is common for young actors who suddenly gain public attention — fans fill information gaps with assumptions. The lesson for researchers: always verify against multiple tier-2 sources before treating family claims as factual.

Is Lilly Bainbridge in it?

Yes — Clara Stack plays Lilly Bainbridge in the HBO series It: Welcome to Derry. The show is a prequel to the 2017 film It, set in the 1960s and exploring the origins of Pennywise the Clown. Lilly is a main character across all eight episodes of the first season, according to the IMDb full credit list.

What is Clara Stack’s role in Welcome to Derry?

Stack plays Lilly Bainbridge, one of the young residents of Derry, Maine, around whom the horror unfolds. The Stephen King Wiki identifies her role as Lilly Bainbridge in the first season. Stack has described learning about the character’s depth through the audition process — she originally auditioned for both Lilly and another character named Marge before landing the lead.

In a video interview, Stack noted that she watched It Chapter 1 when she was about nine years old, but didn’t initially think she’d be part of the franchise. The role marks her first foray into horror — and her highest-profile credit to date.

“Welcome to Derry season finale is out now!”

— Clara Stack, via Instagram caption

“Actress known for appearing in television series including Madam Secretary, Bull and Hawkeye.”

— Famous Birthdays profile description

The implication: Stack’s casting in Welcome to Derry positions her as part of the next generation of young actors carrying a major franchise. With the show’s built-in audience from the It films and Stephen King’s novels, her visibility is likely to grow significantly through 2026. For fans of the Jacob Lofland profile, there’s a parallel — both actors are building careers from franchise-adjacent roles into lead opportunities.

Fans interested in Clara Stack’s journey from self-tape to the set of Welcome to Derry can find a comprehensive overview in Clara Stacks biography and role.

Frequently asked questions