The Love Hypothesis movie is finally here — and BookTok can stop holding its breath. Prime Video released the adaptation of Ali Hazelwood’s bestselling romance today, Wednesday, September 23, turning one of the internet’s most beloved fake-dating stories into a full romantic comedy.
Lili Reinhart leads the cast as Olive Smith, a brilliant Ph.D. candidate who talks herself into a fake relationship with the most intimidating professor on campus. Meanwhile, Tom Bateman plays Dr. Adam Carlsen, the gruff academic who agrees to play along. The result is a slow-burn romance that fans of the novel have been waiting years to see on screen.
What Is The Love Hypothesis Movie About?
The story starts with a panicked decision. Olive learns that her best friend Ahn has fallen for Jeremy, the guy Olive used to like. So Olive needs proof that she has moved on — fast. She impulsively kisses the first intimidating man she sees, who turns out to be Dr. Adam Carlsen.
Adam, however, has his own reasons to fake a relationship. The university is reviewing his research grant, and a stable partnership could help his case. Therefore, the two strike a deal: pretend to date, follow strict rules, and keep feelings out of it.
Of course, the plan falls apart in the best possible way. As their arrangement blurs the line between performance and reality, Olive must face her most daunting hypothesis yet: that love might actually be worth the risk. Fans of the book will also spot beloved moments from the novel, including the famous sunscreen scene.
Meet the Cast of The Love Hypothesis Film
Reinhart is best known as Betty Cooper from Riverdale, which ran for seven seasons from 2017 to 2023. In addition, she starred in and executive produced the romantic drama Chemical Hearts and published a poetry collection, Swimming Lessons. She also serves as an executive producer on this film, alongside Hazelwood.
Bateman brings serious dramatic chops to the role. The British actor broke out as Giuliano de’ Medici in Da Vinci’s Demons and later appeared in Kenneth Branagh’s Murder on the Orient Express and Death on the Nile. More recently, he starred in Peacock’s Based on a True Story. For a closer look at his career, Parade breaks down who Tom Bateman is ahead of the premiere.
The supporting cast includes Rachel Marsh as Ahn, Nicholas Duvernay as Jeremy, plus Jaboukie Young-White and Arty Froushan in key roles. Behind the camera, Claire Scanlon (Set It Up) directed from a screenplay by Sarah Rothschild, with Elizabeth Cantillon producing through The Cantillon Company alongside MRC and Bisous Pictures. TheWrap has more on the first trailer that debuted at Prime Video’s Obsessed Fest in June.
Why the Reylo Fanfiction Backstory Matters
Here is the wildest part. The novel began in 2018 as Head Over Feet, a Star Wars fanfiction about Rey and Kylo Ren — the “Reylo” pairing. Hazelwood, a neuroscientist writing under a pen name, later reworked it into an original romance. Berkeley Books published it as The Love Hypothesis in 2021, and it became a New York Times bestseller.
Then came the perfect casting twist. Bateman is married in real life to Daisy Ridley, the actor who played Rey. His character is even named Adam, after Adam Driver, who played Kylo Ren. Gizmodo called it a brilliant piece of meta-casting, and fans clearly agree.
Why BookTok Is Losing Its Mind Over the Release
The hype did not start this week. Back in the summer of 2025, Reinhart ran a playful social media campaign, posting as if she were Olive herself. As a result, the character gained a life of her own online more than a year before the premiere.
She kept the momentum going on the press tour, too. Reinhart wore outfits inspired by three classic rom-com heroines: Drew Barrymore in Ever After (1998), Kate Hudson in How to Lose a Guy in 10 Days (2003), and Keira Knightley in Atonement (2007). For example, each look nodded to the romantic films that shaped a generation of viewers.
The release also fits Amazon’s bigger push into young-adult romance. After the success of The Summer I Turned Pretty and Off Campus, Prime Video is clearly betting that BookTok adaptations are the future. On the other hand, this one has something extra: a built-in audience that has been quoting the book online for years.
How to Watch The Love Hypothesis
The Love Hypothesis is streaming now, exclusively on Prime Video. Amazon MGM Studios is handling distribution. So if you have a Prime membership, you can press play tonight.
Finally, here is the big question for readers: does the movie live up to the book? Early buzz suggests the chemistry between Reinhart and Bateman carries the film. But the real verdict belongs to the fans who made the novel a phenomenon in the first place.
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