Mariah Carey is unreal … we got audio of her full dress rehearsal for her Vegas show which opens tonight, and she sounds as good as she did in 1990 when she hit #1 with “Vision of Love.”

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Mariah performed for more than an hour Monday night to a packed house at The Colosseum at Caesar’s Palace, and you gotta hear it. She hits every high note and sounds flawless.

We got audio from someone in the audience … filled with various people who work in Vegas-related businesses. We posted a minute-and-a-half and sampled 4 songs. Wait till you hear her hit the high notes in “Emotions.”

As for the naysayers who claimed she wasn’t rehearsing enough … whatever she did was clearly enough