Christina Aguilera and Jimmy Fallon went undercover on the subway to perform. Of course, no one was fooled. You can’t disguise that voice!

“We’d like to do one more song for you if you don’t mind right here,” Jimmy said. “First we’d like to introduce ourselves, my name is Jimmy Fallon and this is Christina Aguilera. Welcome to New York City and welcome to the subway!”

“It’s so hot in here, oh my God,” she said. LOL!

Watch below: