Rising starMackenzie Davisis in talks to joinKristen Stewartin TriStar’s lesbian rom-comHappiest Season, Collider has confirmed.

Stewart will play a young woman who is planning to propose to her girlfriend in front of her girlfriend’s family. The catch? Her girlfriend (Davis) hasn’t come out yet to her conservative parents.

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Happiest Seasonmarks the second film from directorClea DuVallfollowing her 2016 debutThe Intervention, though it will be her first studio movie. She also co-wrote the script with actressMary Holland, who I’m told will be playing Davis' sister –  the nicest, weirdest and most accepting member of her family, who treat her like a bit of a black sheep compared to her sisters.

Temple Hill’sMarty Bowen,Isaac KlausnerandJaclyn Huntlingare producing the film, whichHannah MinghellaandShary Shiraziwill oversee on behalf of TriStar.

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DuVall is a promising filmmaker and between Stewart and now Davis, this is a great cast for a movie about the struggle to come out, something that no one should ever have to feel any shame over. I’ll be interested to see what the tone of this as, asthe Hollywood Reporterdescribed it as a romantic comedy, but I’m sensing some dramatic elements here, particularly given the casting.

Best known for the acclaimed AMC seriesHalt and Catch Fire,Davis is coming off a well-reviewed turn oppositeCharlize TheroninJason Reitman’sTully. She next stars inTim Miller’s upcomingTerminatormovie alongsideArnold SchwarzeneggerandLinda Hamilton, and she has also wrapped Amblin’s horror movieThe TurningwithFinn WolfhardfromStranger Things. Davis, who also appeared in the sci-fi moviesThe MartianandBlade Runner 2049,is represented by UTA.

Holland is an up-and-coming actress who is coming off a widely-seen AT&T commercial in which she plays a grown woman who sends emails to Santa and refuses to share his email address. She has appeared on numerous TV shows includingBlunt TalkandVeep, and just shot a pilot for Comedy Central calledRobbie. Holland also popped up inMike and Dave Need Wedding Dates,Brie Larson’s directorial debutUnicorn Store, and she played the scene-stealing triage nurse in Netflix’s raucous comedyThe Package. This year, Holland will be seen in the soccer mom comedyGreener GrassandDolly Wells' indie dramedyGood Posture. she’s repped by ICM Partners and Atlas Artists.