Zac Efron Shows Off His Singing & Dancing Skills in 'Greatest Showman' Rehearsal Video - Watch!

Zac Efron is bringing on the High School Musical nostalgia with these moves! The 30-year-old actor posted a video on Thursday (November 16) from a rehearsal for The Greatest Showman, his P.T. Barnum-inspired original musical debuting on December 20. PHOTOS: Check out the latest pics of Zac Efron “Ladies and Gents this is the moment