Mackenzie Frances Ziegler (born June 4, 2004) is a singer and dancer. She is best known for appearing on Lifetime's reality series Dance Moms. Her first single, "It's A Girl Party", reached #1 on the iTunes pop chart list in the US. Her inspiration is her 11-year-old sister Maddie Ziegler, also a dancer. Her album, entitled Mack Z, reached #1 on the iTunes pop chart list and #7 on the overall charts. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.