Sydney Sweeney has been on many a best-dressed list this year, with the star frequently offering a modern take on bombshell glamour. But at the Echo Valley premiere in London, she went into full fairytale mode, swapping her signature style for something a little more romantic and decidedly Old Hollywood.

Her latest film sees her star opposite Julianne Moore as a troubled mother-daughter duo in a gritty psychological thriller—but there’s nothing method about her promo wardrobe, styled by super stylist Molly Dickson. On the red carpet, she wore an aquamarine halterneck gown by Miu Miu, featuring a keyhole cut-out at the bust and a sweeping train.

The look marks another chapter in the actor’s longstanding relationship with Miu Miu. Earlier this year, she wore a glittering gown by the Italian brand to the Met Gala, inspired by old Hollywood icon Kim Novak (whom she is playing in a forthcoming film).

Meanwhile, for the Echo Valley afterparty, she slipped into yet another Miu Miu number, this time a sugary pink satin dress, featuring an embellished bodice.