Demi Lovato
took her hair in a drastically different direction over the weekend -- and went from brunette to red hot red-head!

"Changing my hair color today.... :)" she tweeted on Saturday, before adding "Red hurr she don't curr..." -- and finally posting a pic of the new 'do.

It's a very different look for the Disney star, who recently got back together with ex-boyfriend Wilmer Valderrama.

What do you think? Vote for your favorite look in the gallery above -- plus see more stars who've gone red!

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