BILLIE Eilish’s fans think she looks unrecognizable after ditching her signature black roots and green lengths for a stunning blond.

The Bad Guy singer’s photo on Instagram quickly acquired over 10m “likes” in just three hours of posting.

Billie shocked fans with her new blond look Credit: Instagram/ Billie Eilish

Billie, 19, shared a photo of her new blond ’do with her 77.9m Instagram followers alongside the caption: “Pinch me.”

Fans of the Grammy Award-winner appeared to go through a huge range of emotions as they took in the hot new look  – one even questioned who it was.

One of Billie’s followers wrote: “Is this the Paramore chick???”

“Who is sheeeee,” questioned another.

The singer has been green and black for quite a while Credit: Alamy

Billie’s hair has become her signature look Credit: Redferns

A third gushed: “So gorgeous Billie.. are you even human? 😍😍😍❤️”

While many others called her “beautiful,” “stunning,” and “incredible.”

One devoted follower compared her to a deity, writing: “It looks like Hannah Montana and Katy Perry had a love child that was born a goddess.”

The new color came as a shock as followers have only ever seen her with black roots and bright green hair.

Billie has seven Grammys Credit: Reuters

However, devoted fans have been anticipating a big for a while; in December, she announced plans to change her signature hairstyle and start “a new era.”

The new look comes after Billie’s documentary, Billie Eilish: The World’s A Little Blurry, premiered February 26, 2021, on Apple TV+.

It follows the young singer’s meteoric rise to stardom since she burst onto the music scene at just 13-years-old.

Billie’s documentary following her career so far in February Credit: Getty

At the age of 19, the singer is already decorated with accolades with 58 wins under her belt including seven Grammy awards.

But it hasn’t been an easy ride for Billie.

But it has not been an easy path to success for Billie. Speaking in the documentary, aged 17, she matter-of-factly tells the camera: “To be honest with you, I never thought I’d make it to this age.

“I’m never happy. I feel the dark things. I’m bad at taking care of my mental health.”

She states: “I thought I deserved it.”

And despite her enormous success, Billie still lives with parents Maggie Baird, an actress and screenwriter, and Patrick O’Connell, a construction worker.

Growing up, she and Finneas were taught to play lots of instruments by their musical parents, who were always singing and dancing.