Billie Eilish has unveiled a huge new back tattoo.

The "What Was I Made For?" singer, 21, took to Instagram to reveal to her 110 million followers the new tattoo, which extends from the nape of her neck past the small of her back.

The photo sparked curiosity among many social media users who questioned what the tattoo meant.

"Looks like a toddler with a marker went to town…" one user wrote on X, formerly Twitter.

"It looks like it took a while," another user wrote. "It seems like she enjoyed it…kinda seems like she's going through it."

Others seemed to be fans of the new ink.

"Billie Eilish tattoo is fire," a fan gushed.

"Please show us the fully colored in version of your tattoo as it looks absolutely killer," another wrote under the post.

Eilish unveiled the tattoo in the fourth photo of a post on Instagram. She captioned the gallery — which also included photos of her purchasing luggage, a Jack-o'-lantern carved to say "Billie" and a new black and red hairstyle — with the scissors emoji.

Earlier this year, the singer-songwriter pushed back on criticism of her evolving style and choices, saying what others think of her is "not (her) responsibility."

"Let women exist!", Eilish wrote on an Instagram story. "Did you know that women are multifaceted? Shocking right? Believe it or not, women could be interested in multiple things."

Experts say Eilish, along with female stars such as Taylor Swift and Khloé Kardashian, face an unspoken pressure to stay current by reinventing themselves several times, although they also receive criticism for these changes.

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"Many feel that multiple different aesthetic eras cannot all be genuine to one person’s true self, so they assume female pop stars are changing purely to fit the times, and not as a means of self-expression," StyleCaster fashion and lifestyle editor Bella Gerard told USA TODAY in May 2021. "Some people might go as far as arguing that staying the same over time is a sign of a male star’s commitment to identity."

Eilish became a breakout star in pop music in her teens thanks to the release of the 2017 EP "Don’t Smile at Me" and her 2019 debut album "When We All Fall Asleep, Where Do We Go?"

The "Everything I Wanted" artist released "What Was I Made For?," a breathy piano ballad, as part of the "Barbie" soundtrack in July.

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Contributing: Edward Segarra, Melissa Ruggieri, USA TODAY