Zac Efron made his first-ever appearance in the Dancing With the Stars ballroom in support of his brother Dylan Efron's semi-finals routines - and, unsurprisingly, caused a complete frenzy with fans. Dylan, 33, and pro partner Daniella Karagach first performed a tango to Prince's "I Would Die 4 U" during the Tuesday, November 18, live show. At the end of the pair's routine, cameras kept panning to Dylan's family and friends in the ballroom - where Zac, 38, sat with younger sister Olivia, 5, perched on his lap.