Demi Lovato Dyes Her (Already-Dyed) Blonde Locks Blue! You Like?

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Following in the footsteps of Katy Perry, Cher Lloyd, Lady Gaga and many others before her, Demi Lovato has gone blue with her 'do! Just in time for her stint on The Tonight Show with Jay Leno, the 21-year-old star showed off her new hair, which is drastically darker than her last bleached-blonde dye job (on the left).

We already know how you feel about the "Heart Attack" singer's blonde vs. brunette debate. Now, weigh in on the blonde vs. blue in the comments below, or on our Demi Lovato message board!

President Barack Obama covers Demi Lovato's "Made in the U.S.A."… sorta.

Quiz: How Well Do You Know Your Demi Lovato Trivia?