Sydney Sweeney is giving off major Elsa vibes.

The actress channeled the “Frozen” princess at the London premiere of her forthcoming film, “Echo Valley,” on Tuesday, sporting an ethereal icy blue Miu Miu dress with a long train.

The show-stopping gown featured a crossed halter top with keyhole and off-the-shoulder sleeves as well as a fitted waist and cascading train.

Sweeney, 27, accessorized with drop earrings and some serious bling in the form of her diamond bracelets and rings. The star wore her hair curly, pulling it back in a very Disney-inspired half-up look, too.

The actress has been on fire during the promotional run of her film “Echo Valley,” sporting multiple princess-style looks. Doug Peters/PA Images/INSTARimages

The “Euphoria” star recently talked about how her body changed to play boxer Christy Martin in an upcoming biopic, gaining 30 pounds of muscle. Brett D. Cove / SplashNews.com

Sweeney has been on a style streak while promoting “Echo Valley,” in which she plays a troubled addict who turns to her mom (Julianne Moore) for help.

She wore a voluminous bright red Vera Wang ballgown at the New York City premiere on June 4, showing off her tiny waist.

And, for the afterparty, she changed into a second curve-hugging red dress — this time swapping the strapless look for an off-the-shoulder mini — and matching heels at the afterparty.

“I didn’t fit in any of my clothes,” Sweeney told W magazine about how her body changed due to intense training to play Martin. “I’m usually a size 23 in jeans, and I was wearing a size 27. My boobs got bigger. And my butt got huge. It was crazy! I was like, ‘Oh my god.’” Getty Images

Sweeney appears to be back to her old physique after filming on the biopic ended in November. James Veysey/Shutterstock

The “Euphoria” star clearly gives it her all when it comes to her on-screen roles. Her 2023 romcom “Anyone But You” spawned real-life romance rumors between her and co-star Glen Powell, and she recently spoke about how her body drastically changed for her role as boxer Christy Martin in an upcoming biopic.

Sweeney revealed she gained 30 pounds of muscle due to intense training. Filming wrapped in November.

“I didn’t fit in any of my clothes,” she told W magazine. “I’m usually a size 23 in jeans, and I was wearing a size 27. My boobs got bigger. And my butt got huge. It was crazy! I was like, ‘Oh my god.’”

In the film “Echo Valley,” Sweeney plays a troubled addict who turns to her mom (Julianne Moore) for help. Anthony Harvey/Shutterstock

The “Anyone But You” star recently defended selling bars of soap with her bath water to fans. Anthony Harvey/Shutterstock

Still, it’s her off-screen antics that have been grabbing headlines. She recently defended selling her bath water to fans through a recent collaboration with soap brand Dr. Squatch.

She admitted that it was her idea to sell a bar of soap with a “splash” of her leftover bath water from a previous campaign with Dr. Squatch.

“I think that it’s more fun to see everybody else talk about it,” she told a reporter at the NYC premiere of “Echo Valley” when asked about the mixed reactions to her latest business endeavor.

When the reporter noted it encourages men to “take showers,” Sweeney replied, “I mean, honestly though.”