Singer/songwriter Mariah Carey arrives at The Colosseum at Caesars Palace to launch her residency "MARIAH #1 TO INFINITY" on April 27, 2015 in Las Vegas, Nevada.

Singer/songwriter Mariah Carey arrives at The Colosseum at Caesars Palace to launch her residency “MARIAH #1 TO INFINITY” on April 27, 2015 in Las Vegas, Nevada.

*TMZ got hold of audio from Mariah Carey’s full dress rehearsal for her Las Vegas show ahead of its opening tonight, and the fact that her voice doesn’t sound suspect has made headlines.

According to the site, Mariah performed for more than an hour Monday night to standing room only at The Colosseum at Caesar’s Palace. TMZ got the audio from “someone in the audience… filled with various people who work in Vegas-related businesses.”

She can be heard in the audio hitting her trademark high notes and sounding like the Mariah from back-in-the-day.

Welcome back, Mimi.

Below, a minute-and-a-half worth of audio from four different songs: