Billie Eilish Dresses as Cowgirl for Kendall Jenner's Halloween Party in Los Angeles

Eilish wore the fun costume to Jenner's party at Chateau Marmont on Saturday.

Billie Eilish is having a rootin’, tootin’ good Halloween!

The 21-year-old singer nailed the spooky season with a fun cowgirl costume for this year's celebrations and was photographed in her get-up as she attended Kendall Jenner's Halloween party at the Chateau Marmont on Saturday.

The singer, who was at the party with her friend, Devon Lee Carlson, wore a red wig, cowboy hat and had a faux shotgun and gun belt, to give her costume an extra dash of the wild wild West. Eilish's fun look also included a blue-and-white gingham blouse, brown pants and a brown belt.

As well as partying alongside the likes of Channing Tatum and Zoë Kravitz, Megan Fox and Machine Gun Kelly, Eilish shared a fun video on her Instagram Story that appeared to be taken on her way home from the bash.

In the clip, the singer sat in a car taking a selfie video while wearing her costume. Illuminated by her camera, Eilish smiled before panning the camera to show her friends and then back to herself making a face funny face.

"When u start getting nauseous in the car with two b----- with emetophobia," she wrote in the caption, adding "ruh roh."

According to the Cleveland Clinic, emetophobia is "is the fear of vomit or vomiting."

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Last year, Eilish's Halloween costume was an eyebrow-raising nod to the age gap between her and then-boyfriend Jesse Rutherford. (A rep confirmed their split to PEOPLE in May.)

At the time, the "Happier Than Ever" singer shared a photo of herself dressed up as a baby and Rutherford dressed as an old man. The Neighborhood lead singer was 31, while Eilish was 20.

Eilish recently made headlines after debuting a massive back tattoo on social media. She had previously teased the oversized ink, but on Oct. 18 she revealed the full artwork.

Related: Billie Eilish Says She Still Struggles with Fame: 'I Have Impending-Doom Feelings Most of the Day'

The photo appeared to be taken during the tattooing process just after the outline of the black ink was done. (In the earlier photo she shared, the tattoo was entirely filled-in.)

The tattoo, which extends from the nape of her neck to her lower back, was done by tattoo artist Matias Milan, according to her earlier post.

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