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

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

The 'Pitch Perfect 3' star looked red hot as she celebrated her big birthday.

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.

Photographer Group/Splash News

The soiree was actually a surprise set into motion by Steinfeld's Pitch 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/Instagram
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.

Hailee Steinfeld/Instagram
Inanna Sarkis/Instagram

Criss showed up to the holiday event in a festive ugly Christmas sweater and later shared a sweet birthday message to his pal alongside a pic of the two from the party.

"I feel like it was just a few months ago I sang at this one’s sweet sixteenth... (yeah, that happened)..." the Glee alum wrote on Instagram. "Happy 21st, dear sweet @haileesteinfeld."

The "Most Girls" singer -- who offiically turned 21 on Dec. 11 -- also shared pics to Instagram of her sweet surprise, including a close-up of that amazing mini alongside her Lyft ride, cupcakes decorated with her likeness and a tiny tequila bottle with a "21" straw in it.

Now that is how you do a 21st birthday!

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