PART II: https://youtu.be/IfIhXPEGOJw The Greatest Showman Co-Stars Zac Efron and Zendaya have some serious chemistry going on. Zac claims she was his favorite on-screen kizz. They seem to be having a great time with each other during the press tour. Friends, or is something more going on? Leave your thoughts in the comments.. Promoting the movie The Greatest Showman and its fellow actors, the movie can be seen in theaters 20th dec.