Superstar Mariah showed off her curves in an embellished nude dress as she greeted her legion of fans on Monday (27 April).
She told the waiting crowds: "No matter what, we're going to make it into a festive moment, darling. It's an extravaganza."
Mariah, 45, arrived at the venue in a classic 1936 pink convertible with mobile billboards of her hit singles trailing behind.
Soon after, the 'Touch My Body' singer was carried through the casino by gladiator-clad men on a red throne.
As she was gathered inside the casino, she declared: "Everyone in Vegas, there's a new girl in town."
Taking in the moment, the mum-of-two began to record her cheering fans on her phone.
Mariah's Las Vegas residency, called 'Mariah #1 to Infinity', features 18 scheduled performances, including Mariah's new single 'Infinity'.
Mariah will kick off her residency on 6 May.
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