Demi's 'Do Is Blue!

Demi LovatoIt's a big week for Demi Lovato. Not only will she make her debut on FOX's song-and-dance series "Glee" tonight, but during yesterday's appearance on "The Tonight Show With Jay Leno," she debuted a new blue 'do—which may or may not be tied to her upcoming Neon Lights tour.

The songstress tweeted, "LIKE NEON HAAAIIIIIRRRRR!!!!" along with a selfie of her dye job. (The 21-year-old had previously been rocking blond locks.)

Demi's never been one to shy away from changing her look, telling MTV News this spring, "It's, like, my only form of rebellion. I don't drink. I don't do drugs. I don't party, so I'm like, 'Tattoos and hair color!'"

So what's next for Demi's coiffure? Leopard print, perhaps?

What do you think of Demi's new 'do? Tell us in the comments and on Twitter!