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Justin Timberlake spent some time with Elvis Duran and Bobby Bones backstage at the iHeartRadio Music Festival, where he talked about bumping into Sir Paul McCartney in Las Vegas and not being able to believe it.

JT was a busy man in Vegas, with the premiere of his new movie with Ben Affleck, Runner, Runner earlier in the week and his closing gig at the iHeartRadio MusicFestival at the MGM Grand Garden Arena Saturday night. Part 2 of Justin's The 20/20 Experience drops September 30th. 

Check out the interview: