The blonde bombshell also rocked her short new bob haircut, and accessorized with earrings by Octavia Elizabeth and rings by Jennifer Meyer.

In the upcoming horror flick the Euphoria star plays an American nun named Cecilia who joins a convent in the Italian countryside, before finding out that her new home harbors a sinister secret.

Sydney Sweeney stunned in a bridal white gown as she arrived to the world premiere of her film Immaculate, during the South by Southwest Film Festival on Tuesday

The Madame Web star, 26, had all eyes on her as she walked the red carpet at the Paramount Theatre in the delicate off-shoulder dress

The White Lotus star wore delicate makeup for the occasion, with just a touch of blush and a nude lipgloss.

While at the event she was spotted mingling with composer Will Bates, 47, who looked dapper in a black velvet suit.

Italian actress Benedetta Porcaroli, 25, was also present, and looked stylish in an oversized grey blazer dress with a fringe skirt wrapped around it.

The fashionista, who stars alongside Sydney in the scary movie, completed the look with vivid pointed-toe red heels.

Also present was actress Simona Tabasco, 29, who showed off her toned legs in a black mini dress with a white collar.

The Naples native added height to her look with black heels, and wore cross earrings.

Spanish actor Alvaro Morte, 49, showed off his edgy style in a black leather jacket and pants. He completed his look with black boots.

Director Michael Mohan cut a dapper figure in a grey suit with a silk green finish.

The gown featured a sizzling side slit that revealed her thigh-high white lace boots underneath

The blonde bombshell also rocked her short new bob haircut, and accessorized with earrings by Octavia Elizabeth and rings by Jennifer Meyer

While at the event she was spotted mingling with composer Will Bates, 47, who looked dapper in a black velvet suit

The duo chatted it up

Italian actress Benedetta Porcaroli, 25, was also present, and looked stylish in an oversized grey blazer dress with a fringe skirt wrapped around it

The fashionista, who stars alongside Sydney in the scary movie, completed the look with vivid pointed-toe red heels

Also present was Italian beauty Simona Tabasco, 29, who showed off her toned legs in a black mini dress with a white collar

Spanish actor Alvaro Morte, 49, showed off his edgy style in a black leather jacket and pants. He completed his look with black boots

Director Michael Mohan cut a dapper figure in a grey suit with a silk green finish

Sydney and her co-stars and director also posed for studio portraits at the event.

For the occasion the actress wore a black blazer with structured shoulders along with a white mini skirt, sheer black stockings, and heels.

Simona showed off her toned legs in a checkered baby blue mini skirt and a pastel blue cardigan.

Meanwhile Benedetta sported a black and white button-up, grey shorts and black shoes.

In the trailer for the flick Sydney is pictured saying: ‘God saved me for a reason. I’m still searching for what that reason is.’

While all appears to be picture perfect, behind the cloistered walls of the abbey, dark forces are at work.

A fellow nun is killed and soon Cecilia discovers she is pregnant.

‘It’s a miracle,’ a priest tells her after nuns use an ultrasound machine, which just happens to be at the convent, to confirm her condition. ‘You are with child.’

Sydney and her co-stars and director also posed for studio portraits at the event

For the occasion the actress wore a black blazer with structured shoulders along with a white mini skirt, sheer black stockings, and heels

Simona showed off her toned legs in a checkered baby blue mini skirt and a pastel blue cardigan. Meanwhile Benedetta sported a black and white button-up and grey shorts

They all posed for a group shot as well

In the horror flick – set to premiere on March 22 – Sydney plays a nun named Cecilia who joins an Italian convent before finding out that it harbors a sinister secret

‘Out of all the women in the world, why did HE choose me?’ a baffled Cecilia asks.

While some believe she is following in the footsteps of the Virgin Mary, others are concerned she may be carrying an ungodly being in her womb.

Frightening and often torturous events begin to take place in which the young nun’s faith and body are tested.