'Dance Moms' star Mackenzie Ziegler is now 13 -- and starring in her first big ad campaign for GE

Little Mackenzie from "Dance Moms" isn't so little anymore!

Mackenzie Ziegler was only six years old when she and her older sister, Maddie, shot to fame on Lifetime's hit series in 2011. The sisters weren't just fan favorites: Their fellow dancers often suspected now-ex instructor Abby Lee Miller of favoring the Zieglers, especially Maddie, for featured performance spots. (Miller has since been sentenced to prison for financial fraud.)

While 14-year-old Maddie made an earlier Hollywood entrance, starring in billion-view music videos for Sia and modeling for major designers like Betsey Johnson and Ralph Lauren, her sister isn't far behind! Mackenzie, who's also made moves in modeling and singing, snagged her first big solo ad campaign with GE.

Below, take a look at Mackenzie through the years in the slideshow -- and watch her electric performance!