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The Summer I Turned Pretty: The Ultimate Guide To Season 3, The Movie Finale, And The Cast's Latest Careers

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The Summer I Turned Pretty has solidified its place as a generational romance, moving past its initial book-to-screen adaptation to become a full-fledged cultural phenomenon. As of December 2025, the series has wrapped its emotional third season and is now preparing for a major cinematic conclusion, leaving fans worldwide buzzing about Belly's final choice and the future of the beloved characters.

The final season, which premiered in July 2025, delivered on the promise of adapting the final book, We’ll Always Have Summer, but with several significant, show-only twists that have kept the 'Team Conrad' and 'Team Jeremiah' camps fiercely divided.

The Main Cast: Full Biography and Career Highlights

The success of the Prime Video series rests heavily on the shoulders of its talented young cast, who have become global stars overnight. Here is a complete profile of the main trio, who brought the iconic love triangle to life.

Lola Tung as Isabel “Belly” Conklin

  • Role: Belly Conklin, the protagonist whose coming-of-age story centers around her summers at Cousins Beach and her complicated relationships with the Fisher brothers.
  • Born: October 28, 2002, in New York City, USA.
  • Age (as of Dec 2025): 23 years old.
  • Career Highlights: The Summer I Turned Pretty is her breakout role, launching her career immediately after her time studying at Carnegie Mellon University. She has quickly become a fashion icon and an influential figure in young Hollywood.

Christopher Briney as Conrad Fisher

  • Role: Conrad Fisher, the brooding, emotionally complex older Fisher brother and Belly’s first great love.
  • Born: March 24, 1998, in Connecticut, USA.
  • Age (as of Dec 2025): 27 years old.
  • Career Highlights: Briney’s breakthrough was his portrayal of Conrad. Prior to the series, he appeared in the film Dalíland (2022) as James. He is a graduate of Pace University's BFA program.

Gavin Casalegno as Jeremiah Fisher

  • Role: Jeremiah Fisher, the sunny, charming, and loyal younger Fisher brother, who is Belly's best friend and second romantic interest.
  • Born: September 2, 1999, in Dallas, Texas, USA.
  • Age (as of Dec 2025): 26 years old.
  • Career Highlights: Casalegno began acting at age seven, appearing in a Papa John's Pizza commercial. Before TSITP, he had roles in films like Noah (2014) and the TV series Walker.

Season 3 Recap: The Time Jump, Finch, and the Final Betrayal

The third and final season of the series, which consisted of 11 episodes, was the most dramatic and polarizing yet, bringing to life the pivotal events of the final novel.

The season began with a significant time jump, a key element of the third book, placing Belly and Jeremiah in a new collegiate environment. Belly and her best friend, Taylor, enroll at Finch University, which is also Jeremiah’s school. This setting immediately intensified the love triangle, as Belly and Jeremiah’s relationship faced the harsh realities of college life and distance from Cousins Beach.

The central conflict of the season revolved around Jeremiah’s betrayal. While the show had already made changes to the source material, the core drama of Jeremiah cheating on Belly while they were on a break—a major plot point from the book—was adapted. This event shatters their relationship and forces Belly to confront her true feelings and the enduring connection she shares with Conrad.

The series masterfully used this turmoil to set up the ultimate endgame, exploring the difference between the comfortable, passionate love she had with Jeremiah and the deep, soul-shaking connection she shares with Conrad Fisher. The final episodes of the season saw Belly grappling with the fallout, with Conrad offering a steady, albeit still complicated, presence.

Major Book-to-Show Differences That Changed the Ending

Creator Jenny Han and the showrunners took liberties with the source material, which added fresh layers of drama and topical authority for fans. Understanding these changes is crucial to predicting the movie finale.

One major shift was the expanded role of supporting characters. The relationship between Belly’s brother, Steven Conklin, and Taylor was significantly developed and became a central focus, which was not as prominent in the books.

Another key difference was the pacing of Belly’s first relationships. In the novel, Jeremiah is Belly’s first kiss, but the show changed this to Cam Cameron, adding a layer of complexity to the Cousins Beach romance dynamics.

The most impactful change, however, was the dramatic Season 3 time jump. While the books feature a time jump, the show's adaptation of the college years and the immediate aftermath of Jeremiah's actions was more drawn out and emotionally charged, giving viewers a deeper look into the 'Jere-Belly' relationship before its inevitable collapse.

The Final Chapter: 'The Summer I Turned Pretty: The Movie'

In a surprising and unprecedented move, Prime Video and creator Jenny Han announced that the series would not end with Season 3. Instead, the final conclusion will be delivered in a feature-length film titled "The Summer I Turned Pretty: The Movie."

This decision elevates the final chapter of Belly's story to a cinematic event, a fitting end for a series that has broken viewership records.

What We Know About the Movie Finale

The movie is set to be the definitive conclusion to the entire saga. Jenny Han herself is slated to write and direct the film, ensuring that the final vision remains true to the spirit of her novels while incorporating the beloved changes made in the series.

As of late 2025, the film has not yet begun filming, with creator updates confirming that the project is still in the pre-production phase. This suggests a release date sometime in 2026, building immense anticipation for the final resolution.

Fan Theories and the Ultimate Ending Prediction

The move to a film has only fueled the intense fan debate. The biggest question remains: Who does Belly choose?

  • The Book Ending (Team Conrad): In the original novel, Belly and Conrad ultimately reconnect through letters while she is studying abroad in Spain, leading to their reunion and eventual marriage. This is the most likely outcome, as the show tends to follow the major plot points of the books.
  • The Death Theory: A darker, though less likely, fan theory suggests that one of the Fisher brothers, usually Conrad, might die, adding a tragic element to Belly's growth. However, this would be a massive departure from the source material.
  • The Final Time Jump: Another strong prediction is that the film will feature another significant time jump—perhaps a few years—to show the characters as mature adults, making Belly's final choice feel more permanent and earned. This would allow the show to fully explore the "We'll Always Have Summer" title, focusing on the enduring nature of their connection.

The film is expected to focus heavily on the themes of destiny, first love, and the lasting impact of the Cousins Beach summers. With the series finale now a feature film, the final moments of Belly, Conrad, and Jeremiah will be under a spotlight like never before, promising a truly unforgettable conclusion to the epic love triangle.

The Summer I Turned Pretty: The Ultimate Guide to Season 3, The Movie Finale, and the Cast's Latest Careers
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