A globetrotting rockstar, Alana Haim (one-third of the band Haim, alongside her siblings Este and Danielle) is no stranger to battling jet lag. “You have to stay past 10:00 p.m. and you can’t—this is the hard part—you cannot drink any alcohol,” she says.

Haim has just touched down in the South of France for the Cannes Film Festival premiere of her second-ever film, Kelly Reichardt’s The Mastermind, in which she stars alongside Josh O’Connor (whom she calls “the greatest human being on the planet.”) “Being in competition means so much to me,” Haim says. “I’ve been talking about [the film] for so long and now people get to see it. It’s half incredibly amazing and half incredibly nerve-wracking. But that’s a great feeling to have.”

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For the premiere, Haim turned to Louis Vuitton’s Nicolas Ghesquière, a longtime friend and collaborator, to fashion her a dress that meets the moment—a drop-waist dress with a black velvet bodice and a voluminous tiered emerald green skirt. “When I put it on, I cried. It’s like my wedding day, honestly. I don’t think my wedding day will be any better than this. It feels like a letdown already,” she says. “To have somebody that is going to give you that confidence in this beautiful gown is the biggest gift I could ever have. I just know that Nicolas will always have my back.”

Haim keeps returning to a quote from Toy Story to describe her first time at Cannes. “When I tell you I am falling with style right now, I am fully Toy Story Buzz Lightyear falling with style,” she says. And in custom Louis Vuitton, who couldn’t?

Below, Alana Haim brings Vogue behind the scenes of the 2025 Cannes Film Festival.