>> Read more trending stories

The 46-year-old singer encouraged about 40 guests to dress up as their favorite version of her.

Carey dressed as Bianca, her alter ego in the 1999 song "Heartbreaker."

The celebration took place at an 18th century villa in Lake Como, Italy, provided courtesy of Airbnb. The listing, which boasts eight bedrooms, 11 working fountains, a bell tower, a private dock, a pool terrace, an indoor gym, a home theater and a billiards room, normally goes for $12,250 a night.

Footage from the party will be used for Carey's upcoming  E! docuseries, which doesn't have a debut date yet but is set to premiere later this year, according to Entertainment Weekly.