Demi Lovato must have the blues

The "X Factor" judge showed off her bold new look  at "The Tonight Show" on Wednesday -- Lovato's traded in her signature brunette tresses for a blue 'do!

The singer wore her hair straight for the Leno performance ... and we actually don't hate the bright color on the 21-year-old. 

The blue hair gives Demi more of a rock star look, and it actually complements her style. While we prefer natural hues, it's a fun change for the young star.

What do you think of Demi's new 'do? Tell toofab in the comment section below, and click "Launch Gallery" above to see more celebs with blue hair!

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