This Halloween, Heidi Klum is wearing an adult diaper.

It’s a first for her, the model and former “Project Runway” host said.

Ms. Klum, who has become known for her elaborate Halloween costumes, transformed into the character E.T. this year for her annual bash held at the Hard Rock Hotel in New York City.

The costume, inspired by the alien from Steven Spielberg’s 1982 film “E.T. The Extra-Terrestrial,” included a glowing fingertip and motorized headpiece with a movable mouth and eyes, controlled remotely by a member of Ms. Klum’s team. The red carpet was also built several feet in the air, so when Ms. Klum stood on the ground behind it, her brown, knobby, otherworldly toes appeared to be on the floor.

“Maybe I never need to use the diaper, but at least that way I don’t have to think about it,” Ms. Klum said, explaining that the look is difficult to put on and take off.

The idea for the costume came to Ms. Klum a few weeks after last year’s event, she said, explaining that “E.T.” was one of her favorite movies as a child. (Coincidentally, Janelle Monáe, another celebrity with a fondness for Halloween, also dressed as E.T. this year.)

“They have no genitals,” Ms. Klum said of the aliens in Mr. Spielberg’s movie. “I like the whole idea of, like, we’re all the same.”

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