Ariana Greenblatt Romantic Comedy ‘Egg Baby’ Adds Kingston Rumi Southwick and Arthur Conti for Amazon MGM

Amazon MGM’s new romantic comedy Egg Baby has added Kingston Rumi Southwick and Arthur Conti to its cast, Deadline reported August 13, with Ariana Greenblatt set to star in the project. The film is being developed as a genre-leaning comedy about unexpected parenthood and interpersonal friction, with casting rounding out roles that will interact around the movie’s premise of a school assignment that spirals into an ongoing responsibility.

Greenblatt stars as a rebellious artist, while the movie also centers on Southwick as a golden-boy quarterback. According to Deadline’s description of the story, the pair are brought together when they are forced to co-parent an egg as part of a health class, an assignment that functions as the film’s catalyst for a relationship built on compromise rather than romance that grows in a more complicated social setting.

Southwick’s inclusion in Egg Baby follows his work on Widow’s Bay, a role Deadline highlights as part of his recent profile. The casting also draws attention to how the film is balancing performers associated with different tones and genres, using Greenblatt for the lead dynamic and Southwick to anchor one half of the co-parenting conflict at the center of the comedy.

Deadline also reported that Arthur Conti, who is tied to Mike Flanagan’s upcoming Carrie, will join the Egg Baby ensemble. The publication framed Conti’s new role as part of the movie’s broader casting announcement, connecting Egg Baby to another high-profile studio pipeline that is already in production development.

Egg Baby is directed by Natalia Anderson and produced as an Amazon MGM project, Deadline said. The script is written by Sawyer Perry, Deadline reported, setting the foundation for how the film will adapt the egg co-parenting premise into dialogue-driven comedy and character-focused scenes.

The new casting additions come with the project still in development, with Deadline’s report focusing on who has joined the film rather than offering release timing or production schedule details. No additional character names, role specifics beyond the central co-parenting premise, or production start dates were included in the reported announcement.

As production develops, the film’s casting and creative lineup will determine how Egg Baby handles its school assignment setup, a premise that requires both comedic timing and believable emotional adjustments as the characters navigate the day-to-day consequences of a classroom exercise that does not stay confined to class.

For audiences, the announcements place Greenblatt at the center of a rom-com concept that emphasizes responsibility and coordination, with Southwick and Conti joining her in roles described through the film’s core relationship structure. The project’s next steps will likely include finalizing additional cast, confirming production timelines, and moving toward principal photography under the reported creative team.