Carpool Karoake is always entertaining but this is destined to be a holiday classic. Oh look Mariah is half naked again . But wait a second and you'll be richly rewarded my friends. James Cordon's classic bit has been mashed up with Demi Lovato, Gwen Stefani, Elton John, Selena Gomez and Chris Martin. But to see Red Hot Chili Peppers do Mariah? Priceless.