Until now, Hari Nef’s portable speaker, which she arrived with on set (not leaving music selection to chance), has been dutifully pumping out Charli XCX, Solange, Fifth Harmony and CeCe Peniston, getting the occasional sing-along from Nef. But the battery has died and in the seconds of silence that follow, the momentum threatens to wane. One look at Nef, though, and it’s clear she’s not about to let that happen. She pulls up the Marc Jacobs leather gloves on her hands, adjusts the Gucci skirt and crosses her Calvin Klein silver boots. “I don’t need music for this look,” she says, and we’re back in business. Having been a star in the fashion industry since becoming IMG’s first trans model in 2015, with contracts with Gucci and L’Oréal and countless editorials in the years that followed, Nef is now focusing on Hollywood, where she has four projects releasing this fall. Nef, 25, grew up in Newton, Mass., and lived in New York for the past six years while modeling; she made the move to Los...