Katy Perry performs onstage during "The Prismatic World Tour" at Madison Square Garden on July 9, 2014 in New York City.

Katy Perry -- and her new red hair -- performed at Harper's Bazaar's New York Fashion Week party. But before she kicked off her show, Perry took a moment to celebrate one very special audience member.

"This one is dedicated to you my lovely lady," Perry said of Mariah Carey. "You paved the way for so many of us. Now you can just enjoy yourself."

Perry then performed her first big hit "I Kissed a Girl."

Check out video of the performance below, courtesy of Just Jared.