It's Halloween, and for those of you who still haven't figured out a costume, Mariah Carey has a suggestion: dress like her.

The diva is running a contest on her website , and is encouraging all fans to be her for Halloween, one of her favorite holidays.  After your costume is complete, take a photo of yourself and email it to TeamMariah@MariahCarey.com by Thursday.  Also include your name, age, location and the answer to this question: "Which Mariah video inspired your costume?"

The most fabulous finalists will get their pictures on Mariah's Facebook page, and will be up for a public vote.  The winner will receive "a wonderful prize," according to the website, but no mention of what that is yet.  So squeeze into your tightest dress, put on a long, flowing wig and your highest heels and carry around two baby dolls with you all night -- you just may be a winner!

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