James Packer

Diners at the famed Ristorante Aurora were stunned when, after a quiet dinner on Sunday, at 11 p.m. a loud Mariah song suddenly blasted, and in walked the star with her fiancé, James Packer, in tow.

“She literally had an entrance song,” our spy marveled.

Carey was “charismatic,” telling stories and having a blast with a group of 10 people, including Uma Thurman’s ex Arki Busson.

E! News has exclusively learned that she is engaged to the Australian billionaire businessman after a fairy tale romance.

Mariah's future hubby popped the big question in her hometown tonight, and he presented her with what can only be described as the most breathtaking engagement ring.

We're told that Mariah's new diamond bling comes in at around 35 carats and that no wedding date has been set just yet.

Wearing a cleavage-boosting, figure-hugging, jewel-encrusted white gown, Carey serenaded the sold-out party.

The Fantasy singer had no less than three outfit changes during the performance, each glittering gown showing off her curvy figure, as well as the decade-old diamond butterfly ring she has been sporting on her wedding finger.