"American Idol" announced the Top 10 last night ... but Mariah Carey was all about showing her top two.

The judge took the stage in a metallic, patent leather Tom Ford dress on Thursday night that not only showed off her thin figure but an insane amount of cleavage.

While the photo Mimi tweeted while getting ready (above) doesn't do her decolletage justice, check out this screen grab from last night's show:


Mariah's never had a problem showing some serious skin ... and, from the looks of it, she has no plans of stopping at age 42.

Do you think it's time for Carey to start covering up, or does she still look great?

Check out some of her sexiest and most outrageous outfits above.

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