After a run of premieres across the United States and Europe, Nicole Kidman has finally returned home to debut her latest screen effort, Lion with Slumdog Millionaire star Dev Patel. In the film, Kidman plays one-half of an Australian couple who adopts a lost Calcutta-born boy (Patel). Two decades on, the young man, Saroo, decides to track down his birth family when memories of his childhood begin to rise to the surface. Rooney Mara also co-stars as Saroo's girlfriend. The film premiered at the Toronto International Film Festival back in September before going wide in November, and now it's migrated Down Under, where Kidman appeared in support wearing a periwinkle, embroidered dress by Canadian designer Erdem Moralioglu. But it wasn't just her dress that caught our eye — it was also her sleek updo, a formal take on every jet setter's favorite: the topknot.

Nicole Kidman in Erdem at the Australian premiere of Lion in Sydney, Australia, December 2016.

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Who: Nicole Kidman.

When: Monday, December 19.

Where: The Sydney premiere of her new film, Lion, where she appeared with the real-life inspiration for the film, Saroo Brierley.

What: A tea-length periwinkle lace dress from Erdem's Spring 2017 collection with floral embroidery, black sandals, and a gentle tousled bun.

Why: Kidman has altered between elegant looks by the likes of Brandon Maxwell and Bohemian-inspired ruffly ensembles from Rodarte — and now Erdem — for the Lion tour of premieres. The Spring 2017 collection by Erdem, which debuted in London in the fall, drew its inspiration in part from an ill-fated voyage of a royal vessel in 1642. The lady-in-waiting to the Queen of England at the time sent her wardrobe on a secret mission to the Netherlands to sell some of her more decadent pieces, but the ship sunk somewhere in the North Sea. The drowned look is reflected both in the embroidered details, which in places almost resemble barnacles and seaweed, in the cool tone of the dress, and in the delicate lace tiers that recall a 17th century royal's wardrobe. Loaded with history and detail, the look is quite a statement for a red carpet, and Kidman offsets the look with a teetering topknot. Old-time look, new school hair.

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