Unlock access to every one of the hundreds of articles published daily on BroadwayWorld by logging in with one click. Mackenzie "Mack Z" Ziegler, the nine-year-old breakout star of the Lifetime's ...

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Mack Z, full name Mackenzie Ziegler, is just ten years old, but her Youtube channel has more than 100,000 subscribers and 10 million views. Earlier this year, her self-titled album debuted at No. 1… ...