Sienna Miller is back on the road for The Lost City of Z. After premiering the film at the New York Film Festival and the Berlinale over the winter, Miller took a brief break to catch some waves in Tulum, Mexico, taking in some vitamin D before embarking on the press tour once more. Last weekend found her on the beach; then, on Wednesday night, she returned to Hollywood and appeared on the red carpet alongside co-stars Robert Pattinson and Charlie Hunnam — as well as a surprise guest, Brad Pitt, who dropped in for the occasion.

Miller, the film's leading lady, is regularly the most striking presence on the red carpet, and her quasi-bohemian look at the west coast premiere this week was no exception. Under Clare Waight Keller's creative direction, Chloé made a perfect match for Miller's own ethereal, free-wheeling aesthetic, and though Keller has since departed for Givenchy, her most recent collections are sure to be red carpet stalwarts for months to come.

Sienna Miller in Chloé at the premiere of The Lost City of Z in Hollywood, California, April 2017.

Rich Fury/Getty Images

Who: Sienna Miller.

When: Wednesday, April 5.

Where: The premiere of The Lost City of Z with Robert Pattinson and Charlie Hunnam at ArcLight Hollywood in Hollywood, California.

What: A tiered, lemon-yellow dress from Chloé's Spring 2017 collection with eyelet details and a short-sleeved silhouette, paired with a Chloé bag, Cartier jewels, and gold sandals with loose waves and neutral makeup.

Why: Maybe she's still in vacation mode, but there's something blissfully laid back about Sienna Miller's latest red carpet look. Never one to go overly formal, Miller stands out against the black-tie looks of her co-stars in a gauzy Chloé design with sun-kissed, beachy waves. It's light and delicate, anchored by an equestrian-style bag and heels — frothy, fun, and doesn't take itself too seriously.

Actress Sienna Miller shares the last movie that made her cry: