Sydney Sweeney Stuns in Pale Blue Dress at Echo Valley Premiere with Julianne Moore and Ashley Roberts

Sydney Sweeney looked the epitome of glamour in a busty blue dress as she posed at the European premiere of Echo Valley at BFI Southbank in London on Tuesday night.

The actress, 27, showed off her incredible sense of style in the halterneck number which highlighted her ample cleavage and had a sweeping design.

She completed her outfit with sparkling silver earrings and wore her blonde tresses in loose waves over her shoulders.

Sydney stars opposite Julianne Moore in the psychological thriller, where she plays an addict named Claire and follows the story of how far a mother will go for their child.

For the premiere Julianne, 64, cut a chic figure in a strapless black gown with quirky flower detailing on it.

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Sydney Sweeney looked the epitome of glamour in a busty blue dress as she posed at the European premiere of Echo Valley at BFI Southbank in London on Tuesday night

The actress, 27, showed off her incredible sense of style in the halterneck number which highlighted her ample cleavage and had a sweeping design

Sydney stars opposite Julianne Moore in the psychological thriller, where she plays an addict named Claire and follows the story of how far a mother will go for their child

Pussycat Doll Ashley Roberts was also in attendance at the premiere and looked stunning in a burnt yellow dress and black corset.

Speaking about the plot previously, Sydney said: ‘My character Claire is not the best daughter and she puts her mom through a lot.

‘Claire shows up covered in blood at her mother’s doorstep in one scene.’

The premiere comes shortly after she finally broke her silence on her split from Jonathan Davino.

Sydney and Jonathan, 41, started dating 2018 and got engaged in 2022 but kept their romance largely out of the public eye.

Over the past few months, though, they were trailed by a swirl of rumours that they had called off the wedding, fuelled by Sydney’s sightings without his ring.

Last week she finally put the swirling speculation to bed by confirming her relationship status while plugging her new film to The Times.

When she was asked whether she was still planning her wedding, she replied: ‘No,’ and when prodded on whether she was single, she said: ‘Yes.’

She completed her outfit with sparkling silver earrings and wore her blonde tresses in loose waves over her shoulders

Speaking about the plot previously, Sydney said: ‘My character Claire is not the best daughter and she puts her mom through a lot’

The premiere comes shortly after she finally broke her silence on her split from Jonathan Davino

Echo Valley stars Julianne as a horse trainer on a Pennsylvania farm and Sydney as her daughter, who turns up one day spattered with someone else’s blood, triggering a thriller plot line and a family drama

For the premiere Julianne, 64, cut a chic figure in a strapless black gown with quirky flower detailing on it

Directed by Michael Pearce, the film also features Fiona Shaw, who is best known to moviegoers around the world as Harry Potter’s Aunt Petunia

Julianne looked as radiant as ever and wore her red tresses in a sleek bun

She added pearl earrings to her look

Sydney and Julianne posed together at the premiere

Brad Ingelsby, Michael Pruss, Fiona Shaw, Sydney Sweeney, Julianne Moore, Domhnall Gleeson and Michael Pearce

The pair chatted away at the premiere

Sydney gave a wave to her fans

The cast posed together

The co-stars clearly get on well

Pussycat Doll Ashley Roberts was also in attendance at the premiere and looked stunning in a burnt yellow dress and black corset

Ashley opted for a quirky hairstyle

And waved to the cameras

Model Roxy Horner wore a flattering black number

It showed off her physique

She added a sleek leather bag to the look

And some statement earrings

Fiona Shaw wore a smart co-ord

Domhnall Gleeson wore a dapper suit

Mae Muller wore a casually chic ensemble

Singer Tallia Storm flashed her abs in a leather co-ord

Love Island’s Jess Spencer wore a figure-hugging white dress

Julianne Moore as Kate Garretson and Sydney Sweeney as Claire Garretson in the film

Caprice Bourret wore a bright yellow dress

She posed up a storm at the premiere

She wore her blonde tresses in a straight style

Kyle MacLachlan plays the husband of Julianne’s character in the new film.

Directed by Michael Pearce, the film also features Fiona Shaw, who is best known to moviegoers around the world as Harry Potter’s Aunt Petunia.

Echo Valley will receive a limited theatrical release in the United States this Friday, and next Friday will become more widely available on Apple TV+.