The former X Factor judge unveiled her new look via Twitter on Thursday night (23 January), just in time for her 'Neon Lights Tour', which begins next month.
Demi had teased an image change on 21 January, tweeting: "Changing my hair again…… NEONLIGHTSTOUR."
The 'Skyscraper' singer is absolutely no stranger to switching up her hair colour having sported everything from black to brown to blonde and red. Most recently, Demi was rocking blue hair.
Demi will kick off her tour on 9 February in Vancouver, Canada. It currently runs through until 17 May, with a stop in Monterrey, Mexico. She'll visit several cities across Canada, the US, Brazil, Argentina, Chile, Mexico.
She'll be supported by Little Mix, Cher Lloyd and American band Fifth Harmony.
Last year, 21-year-old Demi quit her role as a judge on US X Factor in order to focus on her music, saying: "It's been really great, but I'm so excited for 2014. I'm going to dedicate it completely and entirely to music – touring and making a new album."
Watch Demi's video for 'Heart Attack' below: