“I’m never going to take it off,” Celine Dion said.

Mugging for a reporter’s iPhone camera with a voice you might associate with Dalmatian coats and Cruella De Vil , she repeated herself.

“I’m never going to take it off,” she said, head lowered, tone rising. “It’s mine! All mine!”

The subject wasn’t what she was wearing at the moment — a green metallic silk jumpsuit from Isabel Marant and Alexander Wang ankle boots — but an outfit by Oscar de la Renta, the one she will have on when the paparazzi go berserk on the Met Gala red carpet on Monday night. It is a creation that would seem as if designed specifically to test the internet’s breaking point.