Justin Timberlake hung out backstage with Elvis at the iHeartRadio Music Festival in Vegas this weekend!

JT closed out Night 2 of the iHeartRadio Music Festival after admitting backstage that meeting Sir Paul McCartney ALMOST made him crap his pants!

Justin will be ultra busy in the coming weeks with the debut of his new movie Runner, Runner, co-starring Ben Affleck, and the release of his album The 20/20 Experience Part 2 later this month.