ICYMI: Jimmy invited a bunch of Mariah Carey super fans ("Lambs") to hear her new song, and then surprised them with a live performance from Mariah herself!
Their reactions are genuinely awesome:
LateNightJimmy: Jimmy gave Sir Richard Branson a holiday treat, and Richard invited Jimmy to…a volcano adventure? Sir, yes, Sir! http://t.co/pneemZ7R
Twitter / LateNightJimmy