Billie Eilish has revealed she pulled a fast one on all of us by hiding her new platinum ‘do under a Billie Eilish Halloween wig prior to its big reveal.

In an interview on The Late Show With Stephen Colbert this week, the singer told the host she “was wearing a Billie Eilish wig” during her previous appearance on the show back in February as she underwent the long process of dyeing her hair from black to blonde.

“From black to blonde [is a] big thing,” Billie explained.

“To do it right and to do it where you’re not murdering your hair and keeping it healthy, I did the first process and then waited two weeks so it could heal and then again, and then waited two weeks.

She continued: “I knew that it would have these processing periods where it would look insane, and I didn’t want to look insane. But I needed something quick, so I literally ordered a Billie Eilish Halloween costume wig on Amazon.”

Though upon ordering the green and black wig, she found it wasn’t exactly what she’d hoped for.

“It was awful. It was the ugliest thing I’ve ever seen,” she said. “[But] I just looked f—king crazy underneath there and I needed to look not crazy.”

After debuting her blonde bombshell bangs on Instagram in March, the star’s post surpassed a whopping one million likes in a mere five minutes, the fastest picture in history to achieve so on the platform.

Fans were loving the singer’s bold change in the comments section, with one exclaiming: “WE ARE SCREAMING.”

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“HELP YOU’RE SO GORGEOUS IT HURTS,” said another fan.

“HELP ME BREATHEEEEEEEE,” one more enthusiastic follower added.

Eagle-eyed fans, however, noted that Billie had actually alluded to switching up her trademark locks in an Instagram story, saying she would make the change following the release of her documentary as she ushered in a “new era”.

In December, the 19-year-old posted her Instagram stories: “I have a fun story to tell you, but first: f—k you guys. Stop making fun of me.”

“My god. I’m f—king making you an album. I will not put it out if you keep making fun of my hair. Shut up!” she told the camera.

“I’m changing it after the doc comes out. It’s going to be the end of an era. I’m gonna give you a new era. I have an announcement to make. I got some s–t to put out.”

Billie’s new album Happier Than Ever will be out July 30.

Check out Billie Eilish on The Late Show with Stephen Colbert: