Sasha Pieterse, best known for playing Alison DeLaurentis on ABC Family’s Pretty Little Liars, looked flawless at the premiere of her new feature film Inherent Vice on Wednesday.

Sasha Pieterse’s ‘Inherent Vice’ Premiere Look

Pieterse, 18, wowed on the Inherent Vice red carpet in an asymmetrical, black Paper London gown that featured a high slit up her left leg. She wore Giuseppe Zanotti shoes to the event at the TCL Chinese Theatre and accessorized with a Giambattista Valli belt, Vhernier earrings and an H. Sternring

Pieterse seemed to like her premiere style, posting multiple pictures from the night on Instagram.

Love this guy @jordanchearn @inherentvicemovie

Ein von Sasha Pieterse (@sashapieterse27) gepostetes Foto am Dez 12, 2014 at 11:29 PST

Couldn’t function without you two ❤️ love you!!! Fotka zveřejněná uživatelem Sasha Pieterse (@sashapieterse27), Pro 12, 2014 at 11:30 PST

In Inherent Vice, Pieterse plays runaway teen Japonica Fenway, who Larry “Doc” Sportello remembers as one of his first cases. Doc is played by Joaquin Phoenix. Also in the film are Joanna Newsom, Josh Brolin, Eric Roberts and Maya Rudolph.

Inherent Vice hits theaters Dec. 12.