Sydney Sweeney wows in bridal white gown with a sizzling slit and thigh-high lace boots as she attends Immaculate premiere at SXSW Film Festival

Sydney Sweeney stunned in a white wedding dress as she arrived at the 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 Theater in the delicate off-the-shoulder dress.

The dress had a sizzling side slit that exposed her thigh-high white lace boots underneath.

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

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

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

The White Lotus star wore delicate makeup for the occasion, with just a hint of blush and a nude lip gloss.

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

Italian actress Benedetta Porcaroli, 25, was also in attendance and looked stylish in an oversized gray blazer dress with a fringed skirt wrapped around it.

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

Also in attendance 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 trousers. He completed his look with black boots.

Director Michael Mohan looked dapper in a gray suit with a silk green trim.

The dress had a sizzling side slit that exposed her thigh-high white lace boots underneath

The blonde stunner also rocked her short new bob hairstyle, and accessorized with Octavia Elizabeth earrings and Jennifer Meyer rings

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

The duo talked about it

Italian actress Benedetta Porcaroli, 25, was also in attendance and looked stylish in an oversized gray blazer dress with a fringed skirt wrapped around it

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

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

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

Director Michael Mohan looked dapper in a gray suit with a silk green trim

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, a white miniskirt, sheer black stockings and heels.

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

Meanwhile, Benedetta wore a black and white button-up, gray shorts and black shoes.

The film’s trailer depicts Sydney saying, “God saved me for a reason. I’m still looking for what that reason is.’

Although everything seems perfect, dark forces are at work behind the monastery walls of the abbey.

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

“It’s a miracle,” a priest tells her after nuns use an ultrasound machine, which happens to be in the convent, to confirm her condition. ‘You are pregnant.’

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, a white miniskirt, sheer black stockings and heels.

Simona showed off her toned legs in a checked baby blue mini skirt and a pastel blue cardigan. Meanwhile, Benedetta wore a black and white button-up and gray shorts

They also all posed for a group photo

In the horror film – which premieres on March 22 – Sydney plays a nun named Cecilia who joins an Italian convent before discovering it harbors a dark secret.

“Why did HE choose me out of all the women in the world?” asks a stunned Cecilia.

While some believe that she follows in the footsteps of the Virgin Mary, others worry that she may be carrying an impious being in her womb.

Frightening and often torturous events begin to occur, testing the young nun’s faith and body.

The film premieres on March 22.