Singer and musician Sia is known for belting out high notes. She can write a hit song, and she can hold a dozen eggs at once. But can she in a car? The answer, of course, is yes. The multi-talented pop star joined "The Late Late Show" host James Corden for the latest installment of "Carpool Karaoke." Viewers learned quite a bit about her. No, the wig didn't come off. In fact, Corden put on a wig so he could fit in with the singer.