Miley Cyrus [1] has had a busy few weeks following the release of her new album Younger Now [2], but we're very thankful she squeezed in time to drive around town with James Corden for a new edition of Carpool Karaoke [3]. The singer, who just finished a week-long residency at The Tonight Show, where she paid tribute to the Las Vegas shooting victims [4] and won a lip-sync battle against Jimmy Fallon [5], helped James get to work this week while belting out some of her greatest hits (as well as using her famous tongue to help him stick stamps on a few letters). Their rendition of "Party in the U.S.A." will make you feel happy all day, so give yourself a mood booster and watch it now!