We never considered Miley Cyrus [1] and Billy Idol a match made in musical heaven, but the duo sure proved us wrong when they delivered a rousing performance of Idol's 1983 hit "Rebel Yell" at the iHeartRadio Music Festival on Sept. 23. The Crisis in Six Scenes [2] star — who's also one of The Voice [3]'s newest judges — surprised everyone when she strutted out on stage in an all-leather ensemble and belted out the second verse with the punk rocker. Maybe the next time they duet, Cyrus can get him to sing some Justin Bieber instead [4]?