June 3, 2021 | 12:54pm

Not even Billie Eilish can resist the siren call of Skims.

On Wednesday, the 19-year-old pop superstar dropped her new music video for “Lost Cause,” which sees Eilish and her pals enjoying an epic slumber party while clad in color-coordinated loungewear in shades of beige, brown, black and pale blue.

“We had the time of our lives being hot & shooting this,” Eilish shared on Instagram.

The Grammy winner spends much of the self-directed clip wearing the Boyfriend T-Shirt ($42) and Boyfriend Boxer ($26) from Kim Kardashian’s shapewear and leisure label.

Some of Eilish’s gal pals are also outfitted in Skims in the video, with the Cozy Knit Short ($58), Stretch Rib High Neck Bra ($42) and Stretch Rib Short ($34) all making cameos.

Billie Eilish wearing Skims in her
Billie Eilish wears pieces from Kim Kardashian’s Skims brand in her new “Lost Cause” music video.
YouTube

Kardashian, 40, seemed thrilled to get the singer’s stamp of approval, and posted a screengrab of the music video on her Instagram Stories, writing, “I spy SKIMS.”

Eilish then reposted the shoutout on her own Stories, adding a heart-face emoji.

Kim Kardashian's Instagram Story about Billie Eilish wearing Skims
Kim Kardashian was excited to spot looks from her Skims line in Billie Eilish’s new “Lost Cause” music video.
Instagram

In “Lost Cause,” the star balances her signature slouchy, oversized style with the lingerie-inspired look she debuted in her British Vogue cover story last month; in addition to baggy tees and sweatshirts, she’s seen in a silky, low-cut powder blue pajama set as well as an olive green cardigan teamed with black lace panties.

Billie Eilish in the
Billie Eilish’s “Lost Cause” video balances her signature slouchy, oversized style with the lingerie-inspired look she’s favored lately.
YouTube

And sexier styles aren’t the only way Eilish is switching up her look ahead of the July release of her second studio album, “Happier Than Ever” — in March, she ditched her green-and-black hair in favor of a pinup-inspired platinum blond dye job.

Billie Eilish parties with friends in her
Eilish parties with pals in her “Lost Cause” video.
YouTube