Lili Reinhart is revealing how she tried (and failed) to get the tea on The Summer I Turned Pretty from Lola Tung. The Riverdale alum, 29, recalled filming horror film Forbidden Fruits with Tung, 23, earlier this year - before TSITP aired its final season on Prime Video - and asking the question on everyone's lips: Does Belly end up with Conrad (Christopher Briney) or Jeremiah (Gavin Casalegno)? Unfortunately for Reinhart, Tung wasn't giving away any spoilers. "I asked her who she ends up with and she did not tell me," Reinhart said during a Tuesday, November 25, appearance on The Tonight Show Starring Jimmy Fallon. Conrad vs. Jeremiah: Inside 'The Summer I Turned Pretty' Love Triangle "She was very secretive about it, which was fine," Reinhart told host Jimmy Fallon. "I was like, 'I have no stake in this game, you can tell me.' She's like, 'I'm not allowed to tell you.'" Despite not being able to extract any spoilers from Tung, Reinhart said of her costar, "She's so wonderful, she's fantastic," adding that they bonded over starring on hit teen dramas. "I felt very protective of her. She's the sweetest person," Reinhart added. Of course, fans of TSITP know by now what happened at the end of the show's third and final season as Belly wound up with Conrad, despite initially getting engaged to his brother, Jeremiah. Chris Briney, Lola Tung Erika Doss / (C)Amazon/MGM Studios / Courtesy Everett Collection Although the TV show concluded in September, Belly's story is far from over, as Amazon's Prime Video and MGM Studios announced a spinoff movie to conclude the series. "There is another big milestone left in Belly's journey, and I thought only a movie could give it its proper due. I'm so grateful to Prime Video for continuing to support my vision for this story and for making it possible to share this final chapter with the fans," creator Jenny Han, who also wrote the book series the show is based on, said in September. "The Summer I Turned Pretty has struck a chord with audiences everywhere, creating moments of joy, nostalgia and connection that have made it a global sensation," added Amazon MGM Studios' head of film, streaming and theatrical, Courtenay Valenti, and Prime Video and MGM Studios' head of television, Vernon Sanders. "We're proud of the series' extraordinary success and couldn't be more excited to partner again with Jenny Han to bring fans an unforgettable next chapter." Earlier this month, Casalegno opened up to Us Weekly about the Jeremiah story line he was "hesitant" to film, revealing that he thought his character might have moved on too quickly with Denise (Isabella Briggs) after calling off his engagement to Belly. Now That 'The Summer I Turned Pretty' Is Over, Watch These 3 Great Shows Now "It might be a little too early for him to be jumping back into a relationship - if Gavin was giving advice," Casalegno told Us. "But he's not, so whatever makes him happy. ... Go for it, but I am definitely hesitant about a relationship for him," he added. As for Jeremiah's relationship with Denise, the actor said: "I think Denise does see Jeremiah in a different light. Belly growing up with Jeremiah, there's like a little bit of familiarity that might have stunted things. Denise is more real and brings different parts of Jeremiah out of him - but I don't know if that is a good or bad thing."