Mariah Carey just listed her 8,200-sq-ft mermaid-themed Mariah Carey Tribeca penthouse at $27 million — her first formal NYC listing in 23 years of ownership.

The Mariah Carey Tribeca penthouse mermaid screening room — wrapped on three walls in a 4,200-gallon aquarium with rainbow tropical fish — has gone viral on Pinterest.

Five bedrooms, five and a half bathrooms, plus a 600-sq-ft built-in recording studio — the Mariah Carey Tribeca penthouse is operationally a working creative compound.

A wraparound 2,400-square-foot rooftop terrace with a heated infinity cocktail pool tiled with a mermaid mosaic anchors the Mariah Carey Tribeca penthouse outdoor program.

An Italian chef's kitchen with twin marble waterfall islands — designed by Mario Buatta during the Mariah Carey Tribeca penthouse's multi-year renovation completed in 2007.