Demi Lovato has posted a picture with the caption "New hair!!!!" on her Twitter.

Perhaps she's celebrating the fact that her most recent single "Heart Attack" has become a hit? In any event, we think it looks great!

Want to see some other stylish transformations? Check out these stars' new 'dos!

Kim Kardashian's shorter bangs.

Kourtney Kardashian's cut and color.

Real Housewife Aviva Drescher's big change.

Miley Cyrus' strange new hue.

So whose hairstyle do you like most—and least? Tell us in the comments section or on Twitter @OKMagazine

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