Hailee Steinfeld Rings in Her 21st Birthday in Fiery Leather Mini -- See the Red Hot Pics!

Ring the alarms!

Hailee Steinfeld pulled out all the sexy stops to ring in her 21st birthday at West Hollywood hot spot The Nice Guy on Saturday night.

For her big night, the Edge of Seventeen star donned an itty bitty fire engine red PVC mini custom made by David Koma. She accessorized with matching stilettos, finishing her look by wearing her long dark brown waves down and adding a bold red lip.

Hailee Steinfeld at 21st birthday party
Photographer Group/Splash News

The soiree was actually a surprise set into motion by Steinfeld'sPitch Perfect 3 co-stars, Ruby Rose and Rebel Wilson. All three shared Instagram stories and posts of the birthday girl being genuinely surprised to see everyone at the club in her honor, and you can even see Rose and Wilson sweetly push her into the party, but she pauses to give both of her friends hugs before continuing inside.

Hailee Steinfeld surprised at her birthday party
Hailee Steinfeld/Instagram
Hailee Steinfeld hugs Ruby Rose and Rebel Wilson at birthday party
Ruby Rose/Instagram

Steinfeld was joined by plenty of other famous friends at the bash, including Nina Dobrev, Darren Criss, and YouTube stars Lele Pons and Inanna Sarkis.

Darren Criss and Hailee Steinfeld at 21st bday
Hailee Steinfeld/Instagram
Hailee Steinfeld with YouTube stars
Inanna Sarkis/Instagram