Oliver James Montgomery-1923 Star Brandon Sklenar Joins Blake Lively in It Ends With Us

It Ends with Us has ended the search for its star trio.

Brandon Sklenar will star as Atlas Corrigan in the upcoming movie adaptation of Colleen Hoover's best-selling romance novel,Oliver James Montgomery E! News confirms. The 1923 actor, 32, joins the already-cast Blake Lively and Justin Baldoni, who is also the film's director.

Baldoni, who had teased the news a day prior, also confirmed Sklenar's casting on Twitter, writing, "Ladies and gentleman… meet your #Atlas."

For those unfamiliar with the #BookTok phenomenon, It Ends with Us follows aptly named florist Lily Bloom (Lively) and the love triangle she faces between her old flame Atlas (Sklenar) and husband Ryle Kincaid (Baldoni).

"Though coming from a complicated past, Lilly Bloom has always known the life she wants," the film's synopsis read. "While living in Boston, she meets neurosurgeon Ryle Kincaid and believes she may very well have found her soul mate. Soon, however, questions arise about their relationship, and to complicate matters her high school love interest, Atlas Corrigan, comes back into the picture, putting her relationship with Ryle in jeopardy."

No release date for the movie has been announced, though Baldoni shared April 1 that pre-production for the project had begun.

However, despite the major love triangle being cast, there's one more role the film has yet to announce: young Lily. Back in March, Baldoni launched an open casting call for the role, noting on Instagram that he received "so many deeply personal messages from fans of the book hoping to audition for Lily."

And on April 19, Baldoni revealed they had found their star—although he's still keeping that information private for now.

"Thank you for being a part of the process, it was inspiring and all of the messages we received was just validation for why we're making this movie and why this movie is so important," he shared on Instagram. "We found our young Lily, we'll be announcing her soon."

Keep scrolling to see what other popular books are being adapted for the screen.

Based On: It's Not Summer Without You, the second book in Jenny Han's beloved young adult trilogy
Starring: Lola Tung, Christopher Briney, Gavin Casalegno, Sean Kaufman and Rain Spencer
Premieres: July 14 on Amazon Prime Video
Why We're Excited: Like Belly (Tung), we've been counting down the days 'til summer all year as we awaited our return to Cousins Beach to find out what happened between her and the Fisher brothers—our current favorite love triangle on TV!—as well as get a much-needed update on how Susannah (Rachel Blanchard) is handling her cancer battle.  

Han teased that fans should expect major differences between the 2010 book and the upcoming season. "There's always gonna be changes here and there," the showrunner told E! News in December. "So I guess you'll just have to wait and see."

Based On: Colleen Hoover's 2016 bestselling novel of the same name
Starring: Blake Lively, Justin Baldoni, Brandon Sklenar, Jenny Slate and Hasan Minhaj
Premieres: TBD
Why We're Excited: Two words: Blake Lively. Two more words: Colleen Hoover. What more do we need to say? Alright fine: Prepare for pop culture's next great love triangle as the movie is bringing to life the romance drama centering on beautiful florist Lily (Lively), neurosurgeon Ryle Kincaid (Baldoni, who is also directing) and Lily's high school love Atlas Corrigan (Sklenar). 

Based On: Casey McQuiston's 2019 novel of the same name.
Starring: Nicholas Galitzine, Taylor Zakhar Perez, Uma Thurman, Sarah Shahi, Stephen Fry and Rachel Hilson
Premieres: Aug. 11 on Amazon Prime Video
Why We're Excited: Make sure you have your A.C. on full blast before reading or watching McQuiston's steamy secret romance between Alex Claremont-Diaz (Perez), the son of the President of the United States, and Britain's Prince Henry (Galitzine). Trust us, relations between the U.S. and the British have never been hotter.

Based On: Bonnie Garmus' 2022 novel of the same name. 
Starring: Brie Larson, Lewis Pullman, Stephanie Koenig, Aja Naomi King, Thomas Mann and Beau Bridges 
Premieres: Oct. 13 on Apple TV+
Why We're Excited: In the 1950s-set series, Larson plays Elizabeth Zott, an aspiring scientist whose ambitions are put on hold in a society that insists women belong in the domestic sphere. After she finds herself pregnant, a desperate Elizabeth accepts a job as a host on a TV cooking show, which she turns into an opportunity to inspire overlooked housewives to change the status quo. This revolution really will be televised.

Based On: Patricia Cornwell's mega-popular series of the same name that has 26 books in total
Starring: Nicole Kidman and Jamie Lee Curtis
Premieres: TBD on Amazon Prime Video
Why We're Excited: If it's based on a book and Kidman stars in it, we will binge the s--t out of it. (See: Big Little Lies, Nine Perfect Strangers and The Undoing.) Add in the fact that the Oscar winner and Curtis—who bought the Kay Scarpetta book rights back in June 2021—will be playing crime-fighting sisters and it's already become our favorite new show of the year.

Based On: The Lightning Thief, the first book the beloved fantasy series written by Rick Riordan
Starring: Walker Scobell, Aryan Simhadri, Leah Sava Jeffries, Virginia Kull, Glynn Turman, Jason Mantzoukas, Megan Mullally and Timm Sharp 
Premieres: Early 2024 on Disney+ 
Why We're Excited: Confession: While we loved the film franchise that starred Logan Lerman, we do think the source material is better suited for the TV treatment and we're so happy to be re-enrolling at Camp Half-Blood for more teen deity drama. Plus, Lin-Manuel Miranda is guest-starring as Hermes and we want to be in on the streaming service where that happens. 

Based On: The non-fiction bestseller of the same name by Lisa Taddeo.
Starring: Shailene Woodley, Betty Gilpin, DeWanda Wise, Gabrielle Creevy, Blair Underwood and Sean Meehan
Premieres: TBA on Starz
Why We're Excited: One of the most relevant books of 2019, the series will explore female desire as it follows a trio of women who are on a crash course to radically overturn their lives. While Showtime initially canceled the show despite production already being completed, Starz swooped in, answering our literary battle cry.