Joey King is a bit of a unicorn: a genuine movie star brought into being by Netflix. As far as movies are concerned, the streamer does make a lot of them, but often seems at a loss to promote them or the actors. But in 2018, King starred in the Netflix-produced “The Kissing Booth” and made enough of an impression to power two sequels.

“A Family Affair,” King’s newest film on the streaming service, may appear to be a kind of lab experiment — how does the buoyant actress react when thrown into a pool with Hollywood luminaries? King is not exactly outclassed by Nicole Kidman, Kathy Bates and Zac Efron. But the movie’s script, by Carrie Solomon, puts her at a disadvantage.

Set in Los Angeles, “A Family Affair” finds King’s character, Zara, stuck in a personal assistant loop with Chris Cole (Efron), an action movie hunk who seems even more shallow and self-absorbed than the average caricature of such types. As is often the case in such arrangements, their relationship is creepily close; in the opening scene, Zara is late delivering the expensive but insincere gift Chris is about to bestow on a girlfriend he’s dumping.

The movie serves up a light critique of Hollywood. Discussing Chris’s latest project, Zara repeats the log line, “It’s like ‘Die Hard’ meets ‘Miracle on 34th Street,’” to which her pal replies, “So it’s not about anything.”

The beacons of integrity here are Zara’s mom, Brooke (Kidman), described by Zara in one of her frequent outbursts as a “Pulitzer Prize, National Book Award whatever,” and Zara’s paternal grandmother, Leila (Bates). Important plot point: Brooke is a widow who hasn’t been on a date in a long time. One afternoon, while dusting the house, Brooke is interrupted by Chris (semi-repentant, he’s looking for Zara, whom he’s just fired for the umpteenth time); they hit the tequila together and erotic attraction flares up. Awkward.

But there’s “something real” between them, they insist to Zara, whose reaction to this development is vehemently off the charts. Until her grandmother gives her a good talking to, King’s character has three modes: peeved, indignant and grossed out. You could almost call the movie “The Longest Eye Roll.” (By contrast, Kidman, once a consistently expressive actress, performs with an inertia that could be read as a form of serenity.)

King gets to show a little charm in the final third of the movie, and it’s refreshing. But every now and then you wonder whether “A Family Affair,” directed by Richard LaGravenese in a mode that vaguely recalls the work of Nancy Meyers, might have been more compelling as, instead of a rom-com, a drama about an entitled, manipulative daughter who almost ruins the lives of those around her.

A Family Affair
Rated PG-13 for adult themes and language. Running time: 1 hour 51 minutes. Watch on Netflix.