Jason Momoa Stands By Adria Arjona at 'Onslaught' Premiere

There is something almost classically cinematic about a movie star showing up for his partner on the red carpet — a gesture as old as Hollywood itself. Jason Momoa did exactly that Wednesday evening, lending his considerable presence to the downtown Los Angeles premiere of Onslaught, the upcoming action thriller headlined by his girlfriend, Adria Arjona.

A Night for Adria Arjona

The premiere unfolded at Regal L.A. Live on August 26, with Arjona, 34, arriving in striking fashion. According to Just Jared, she wore a Calvin Klein Collection Fall 2026 runway piece — look 13, a black strapless column dress distinguished by an exposed contrasting corset detail — and accessorized with Apollo by Tiffany & Co. ear clips and a matching ring. The ensemble struck the kind of sharp, architectural silhouette that tends to read as effortlessly commanding on a red carpet, which felt fitting for an actress stepping into a clear action-lead showcase.

Momoa, whose own appetite for physically demanding, character-driven genre work is well documented — from frontier epics to superhero mythology — appeared alongside Arjona in a display of easy affection that photographers were quick to document. The couple's dynamic read as genuinely warm rather than performative.

The Film Itself

Onslaught arrives in theaters, including IMAX screens, on September 4, with advance screenings beginning September 3. The premise is lean and purposeful in the tradition of high-concept action cinema: when a rogue unit of genetically engineered super soldiers escapes into the desert, an Army sniper must draw on every resource she has to keep her young daughter alive. It is a premise that puts the maternal-warrior archetype front and center, a lineage with deep roots stretching back through films like Aliens and Haywire.

Arjona was joined at the premiere by an ensemble that signals real creative ambition for the project. Co-stars Dan Stevens, Drew Starkey, Eric Wareheim, Reginald VelJohnson, Michael Biehn, and Blake Kennedy were all on hand for the evening. The presence of Biehn in particular — a genre veteran whose career runs through The Terminator and Aliens — adds a certain lineage to the production. Formal critical reviews had not yet been released at the time of the premiere, though the film has been generating considerable positive anticipation.

A Relationship That Grew From a Shared Set

The story of how Momoa and Arjona came together is one of those slow-burn narratives that cinema itself tends to favor. The two first crossed paths professionally when they appeared together in the 2021 Netflix thriller Sweet Girl, but their romantic relationship did not develop until considerably later. Momoa made the pairing public in May 2024, sharing photographs from a trip to Japan with a caption that name-dropped motorcycles, new friendships, and a heartfelt reference to Arjona as "mi amor."

It is a trajectory that mirrors, in some ways, the broader arc of Momoa's public persona — someone who operates with a kind of open-hearted sincerity that tends to cut through the usual celebrity guardedness. Fans of his work across very different registers, whether in rugged historical drama or blockbuster franchise fare, will recognize that quality as consistent.

What to Watch For

With Onslaught positioned for a wide theatrical release including IMAX — a format that rewards scale and kinetic action choreography in equal measure — the film represents a significant opportunity for Arjona to cement herself as a genuine action lead. Tickets are currently on sale. For audiences drawn to high-stakes genre filmmaking built around a compelling central performance, September 4 is worth marking on the calendar.

Related on Ni4o: Why Jason Momoa as Lobo in 'Supergirl' Is the Role He Was Always Meant to Play