Not only does Billie Eilish have quite the discography of number-one hits, but she also has an impressive collection of body art (see: her discreet sternum tattoo). The pop star gave her fans a glimpse at her new sci-fi ink just in time for Halloween.

On Wednesday, Billie shared a carousel of snaps, documenting her recent life happenings, which included a trip to the tattoo parlor. In addition to her BeReal screenshots and selfies, the pop sensation unveiled her latest tat, perfected by tattoo artist Matias Milan. The new ink include an intriguing design that beautifully traces down the length of her spine. She left her 110 million followers wondering the meaning behind the elaborate new back tat and exactly how long she's had it.

Fans quickly rushed to the comment section to point out the intricacy of the tattoo. One wrote, “back tatt so fye,” while another added, “TATTOO REVEAL OMFG.”

However, fans first suspected the newest addition back in September, when she posted a photo dump with the first slide giving a sneak peek of the never-before-seen tattoo. In the snap, the massive tattoo crept up her neck and stuck out of her T-shirt.

Last June, Billie also gave fans a look at her secretive chest tattoo thanks to a close friend's photo dump featuring a snap of Billie in a string bikini that showed off the tat, which reads, “Eilish,” written in a black gothic font.