Mariah Carey Living Large in Paris

Mariah Carey lived like royalty in Paris ... with one of the best views of the Eiffel Tower in the world ... and it didn't come cheap.

Mimi and fiance James Packer hit up the Plaza Athenee Hotel for the European leg of her tour and the two cozied up in the pad's Presidential Suite. And get this -- the room runs right around 14000 Euros a night -- that's almost $16k U.S. and Mariah stayed 5 nights.

The price might sound crazy ... but not if you're one of the best singers in the world and engaged to one of the richest dudes in the world.

C'est magnifique!