James Corden's latest Carpool Karaoke session is here, and the latest guest is none other than the insanely talented Sia. The Australia singer drove around town with the host of The Late Late Show and showed off her amazing voice and hilarious personality. In addition to belting out her hits like "Alive" and "Chandelier," they also rock out to Rihanna's "Diamonds" and talk about Sia's famous wig. James then tries to imitate her signature notes before the two talk about believing in aliens. Watch the funny clip above, then check out all of James's Carpool Karaoke sessions.