Nowadays, you can't really call yourself a big celeb unless you've appeared on Carpool Karaoke.
Elton John was the last famous face to jump into James Corden's SUV, now it's the turn of Sia.
The quirky Elastic Heart singer starts things off in the most Sia way possible, by not being able to find the car because of her ridiculous hair.
When she finally finds her way into the car, the pair talk about everything from aliens to what the hell she's actually saying in her songs - And lots of singing, obviously!
James and Sia belt out the biggest hits that Sia sang and wrote like Chandelier, Diamonds and Rihanna's Diamonds.
Watch it now and see if Sia can really carry twelve eggs in her hands... seriously:
