This was incredible!!!! Christina Aguilera sang all of the throwback hits with James Corden on Carpool Karaoke!!! Yes they did all the favs, "Fighter" and "Genie in a Bottle," and then Melissa McCarthy popped in to sing Redman's verse in "Dirrty"!!! Xtina even talked about her Disney days and about who had a crush on who back in the day when she and Britney Spears, Ryan Gosling and Justin Timberlake were in the Mickey Mouse club together.