Just when you thought the party’s over, the Grammy winner surprises again.

Eilish was looking back at 2021 on Jan. 3. She asked her followers via social media to identify a date and she shared a photo or video taken within the next 24 hours.

One follower chose November 22. While others stuck to Halloween and other major holidays, another followed suit. As it turns out, Eilish was undergoing a hair transformation fans didn’t know about—until now.

She wrote, “Took out the blonde and went red for the week hehe,” while showing off her salon style. Although the 20-year-old eventually decided on brunette locks, fans were shook by the chic hue that she almost kept a secret.