\\brMack Z is a singerdancerreality TV star best known from the hit Lifetime show Dance Moms which also features her mother and Sister Maddie. This is her .brMackenzie performs her hit Holiday Tune Christmas All Year Long on Good Day New York Christmas Eve morning 2014!! Get her Holiday Single on iTunes .brCheck here every Wednesday for new vids and all sorts of exciting new stuff. XOXO Mack Z Dont forget to subscribe.brSUBSCRIBE! Hi BBoys & BGirls! Thanks for watching the final episode in #MattyBSummer2014! This week, after getting caught in a .