The young cast is filled with newbie actors, like Lola Tung, Gavin Casalegno, and Sean Kaufman.
Rachel Blanchard is known for "7th Heaven" and Jackie Chung was on "Grey's Anatomy."
Belly is Lola Tung's first professional acting role.
Isabel "Belly" Conklin is spending the summer at the Fisher's beach house in Cousins like she has her whole life.
Gavin Casalegno plays Jeremiah Fisher.
Jeremiah is one of the two Fisher boys who've been in Belly's life since she was born.
Gavin Casalegno previously appeared on shows like The CW's "The Vampire Diaries" and in films like "Noah" (2014).
More recently, Casalegno played Trevor Strand on The CW's "Walker."
Conrad, Jeremiah's older brother, is played by Christopher Briney.
Conrad is the older Fisher boy, and Belly's first love, who's suffering through his last summer before college.
Before taking on the role, Christopher Briney wrote and directed the short "Paix."
Sean Kaufman plays Belly's older brother, Steven.
Belly's snarky older brother Steven is also spending his summer in Cousins.
Belly's mother, Laurel, is played by Jackie Chung.
Laurel is Belly and Steven's mom and Susannah's best friend.
Chung also wrote and starred on the miniseries "Finding My America."
Susannah, Jeremiah and Conrad's mother, is played by Rachel Blanchard.
Susannah is Laurel's best friend and Jeremiah and Conrad's mom.
Before joining the cast, Rachel Blanchard was best known for starring as Cher on ABC/UPN's "Clueless" sitcom, Roxanne on The WB's "7th Heaven," and Emma on Audience Network's "You Me Her," along with other TV roles.
She also recently appeared in the Ben Affleck-led Hulu drama "Deep Water" (2022).
Cam is played by actor David Iacono.
Belly meets Cam at the beach bonfire.
David Iacono has appeared on a few successful TV shows, including Netflix's "Grand Army," HBO Max's "The Flight Attendant," and Showtime's "City on a Hill."
Rain Spencer plays Belly's best friend, Taylor.
Taylor is Belly's childhood best friend who comes to visit her in Cousins for her birthday.
She's played by Rain Spencer, who previously appeared on KoldCast TV's "The Super Man."
Like Tung, Minnie Mills is making her professional acting debut on "The Summer I Turned Pretty."
Shayla, who's dating Steven, is one of the fellow debutantes Belly meets in Cousins.
The character is Minnie Mills' first acting credit.
Alfredo Narciso plays rival author Cleveland.
Laurel meets another author in town named Cleveland, who's working on a book about sailing with Conrad's help.
Alfredo Narciso has credits on a number of TV shows, most notably, Netflix/NBC's "Manifest."
Summer Madison plays former debutante Nicole.
The current debutante girls are introduced to former debutantes who guide them through the process.
Belly's "big sister" is Nicole, who's also seeing Conrad.
Summer Madison previously appeared on Showtime's "First Wives Club," on ABC's "The Wonder Years" reboot, and in "Emergency" (2022).
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