WELCOME TO THE FINAL SHOW: HARRY JUMPS IN CORDEN'S CARPOOL

The main event of Harry Styles' week on James Corden's show came with a spirited Carpool Karaoke session. It began with the Columbia star's "Sign of the Times," the lead single from his #1 album (replete with killer falsetto and much air drumming). The pair also harmonize on the ballad "Sweet Creature" and shout rocker "Kiwi" from Styles' set. They cement their bond by trading shirts, then kick it to OutKast's "Hey Ya," offer a very tender take on Diana Ross and Lionel Richie's "Endless Love," and play some touching scenes from assorted romantic films. Needless to say, there's some pretty serious chemistry.