The 20-year-old actress attended the 89th Annual Academy Awards at Los Angeles' Dolby Theatre at the Hollywood & Hollywood Center on Sunday, stepping out in an ensemble that will surely be making ET's Best Dressed List.
The Edge of Seventeen star gave off major princess vibes in a stunning floor-length Ralph & Russo couture gown, which featured a sheer overlay and metallic, pastel-colored flowers.
The back of the dress, made up of a long train and gray ruffles along Steinfeld's spine, was equally stunning.
She completed her look with a dramatic smokey eye, light pink pout, elegant updo and diamond stud earrings.
The Oscars air live on ABC at 8:30 p.m. ET / 5:30 p.m. PT. You can catch all of ET's live coverage right here on ETonline.com, on Twitter (@etnow), Instagram (@entertainmenttonight)and Facebook ahead of Monday's full post-show coverage airing on Entertainment Tonight.
As we patiently wait to see who will take home the night's top honors, click through the slideshow below to see all of the red carpet looks!