The Actress Who Plays Lacie Barone: Everything To Know About Lily Donoghue, The Star Behind The Summer I Turned Pretty's Biggest Drama

The question of "who plays Lacie Barone" has become one of the most searched queries for fans of *The Summer I Turned Pretty* as anticipation builds for the highly-awaited third season. As of December 2025, the actress bringing the pivotal, drama-inducing character of Lacie Barone to life is the talented American star, Lily Donoghue. Her casting signals a major shift in the series' central love triangle, introducing a character whose past connection to Jeremiah Fisher is set to ignite the biggest conflict yet between Belly, Jeremiah, and Conrad.

Lily Donoghue steps into the role of Lacie Barone, a character whose presence is directly tied to the growing rift between Belly Conklin and Jeremiah Fisher. Lacie is introduced as Taylor's sorority sister, but her true significance lies in a revealing moment that occurs during Jeremiah's college break from Belly. The introduction of this new entity, especially one with such a scandalous connection to a main character, confirms that the final season will be packed with the emotional turmoil and high-stakes romance that fans have come to expect from the adaptation of Jenny Han's beloved book series.

Lily Donoghue: A Comprehensive Biography and Filmography

Lily Donoghue, the actress behind the character Lacie Barone, is a rising star who has already made her mark in both film and television. Her background includes roles in various genres, showcasing a versatile acting range that makes her a compelling addition to the *TSITP* cast.

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• Full Name: Lily Marie Donoghue
• Date of Birth: January 19, 1998
• Age (as of Dec 2025): 27 years old
• Nationality: American
• Occupation: Actress
• Notable Film Roles: Marty Coolidge in *Black Christmas* (2019), *Dr. Bird's Advice for Sad Poets* (2021)
• Notable Television Roles: *Halt and Catch Fire*, *Dirty John: The Betty Broderick Story*, *The Summer I Turned Pretty* (Season 3)
• Character in TSITP: Lacie Barone

Donoghue is best known for her role as Marty Coolidge in the 2019 Blumhouse horror film *Black Christmas*, a performance that cemented her presence in the acting world. She has also appeared in the true-crime anthology series *Dirty John: The Betty Broderick Story* and the critically acclaimed drama series *Halt and Catch Fire*. This diverse background suggests she has the dramatic chops to handle the intense emotional scenes that the Lacie Barone storyline will require in *The Summer I Turned Pretty* Season 3.

Lacie Barone's Explosive Role in The Summer I Turned Pretty Season 3

The character of Lacie Barone is a new addition to the cast for *The Summer I Turned Pretty* Season 3, which is based on the final book in the trilogy, *We'll Always Have Summer*. While she is initially introduced as a sorority sister of Taylor, Belly's best friend, her plot significance quickly escalates into a major source of conflict for the central couple, Belly and Jeremiah.

Lacie Barone is the girl with whom Jeremiah Fisher had a fling while he and Belly were on a break during their college years. This revelation is a cornerstone of the drama in the third book and is expected to be a major catalyst for the emotional unraveling and eventual resolution of the long-standing love triangle involving Belly, Jeremiah, and Conrad Fisher.

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The Jeremiah Fling: A Catalyst for the End Game

The "Lacie Barone fling" is a plot device that serves several crucial narrative functions in the story:

• The Ultimate Betrayal: For Belly Conklin, the knowledge of Jeremiah’s infidelity with Lacie, even during a break, is a devastating blow. It forces her to confront the realities of her relationship with Jeremiah and his true character, especially in contrast to the steady, more reserved nature of Conrad.
• Fueling the "Team Conrad" vs. "Team Jeremiah" Debate: The introduction of Lacie Barone and the details of the fling are designed to sway fan sentiment. It provides a clear, high-stakes reason for Belly to question her future with Jeremiah, pushing her closer to her "endgame" decision.
• College Life Drama: As Taylor’s sorority sister, Lacie is part of the new college setting for the characters, specifically at Finch University. This environment, far from the idyllic Cousins Beach, introduces a more mature and complicated layer of drama.

The actress Lily Donoghue’s portrayal of Lacie Barone will need to balance the character’s position as both a friend to Taylor and a dramatic foil to Belly. The intensity of this storyline is what makes Lacie Barone one of the most talked-about new entities in the *TSITP* universe, and Donoghue's performance is highly anticipated by the global fanbase.

Lily Donoghue's Journey to Cousins Beach and Beyond

Lily Donoghue's career trajectory shows a consistent move towards high-profile, fan-favorite projects, with *The Summer I Turned Pretty* being her latest and arguably most globally recognized role. While her character, Lacie Barone, may only appear in Season 3, the impact of her storyline is monumental for the main cast.

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Before securing the role of Lacie, Donoghue demonstrated her range in a variety of other television and film projects. Her performance in the slasher film *Black Christmas* as Marty Coolidge, a college student trying to survive a holiday massacre, showcased her ability to handle intense, high-emotion scenes. This experience will be invaluable as she navigates the emotionally charged scenes involving Jeremiah, Belly (Lola Tung), and the fallout of the affair.

Fans eager to see more of the actress can look back at her past work, which includes appearances in television series that highlight her versatility. Her addition to the *TSITP* ensemble, which includes established fan favorites like Lola Tung (Belly), Christopher Briney (Conrad), and Gavin Casalegno (Jeremiah), is a testament to her rising status in Hollywood. The dynamic she creates with the main cast, particularly in the context of the Jeremiah fling and Taylor's (Rain Spencer) sorority life, is one of the most compelling reasons to tune into the final season of the Amazon Prime Video hit series.

In summary, Lily Donoghue is the actress who plays Lacie Barone, and her character is far more than a simple side role. Lacie is the key to unlocking the final, most dramatic chapter of Belly’s story, acting as the catalyst that forces the inevitable conclusion of the Fisher brothers’ love triangle. Her arrival is the signal that the summer of fun is officially over, and the time for tough decisions has begun.