Ariana Grande may not have a singer in season 21 finale, but that didn't stop her from delivering an incredible performance!The first-time coach took the stage with Kid Cudi during Tuesday's epic live finale to perform their new track, «Just Look Up.» The song is featured in Adam McKay's star-studded Netflix film,, in which Ari and Cudi cameo as an A-list couple, tasked with warning their fans about the end of the world — through song, of course.Dressed in a floor-length golden gown and black