Wondering what happened to Abby Lee Miller, why Mackenzie, Maddie and Nia were absent from the special and how to watch all the drama unfold first-hand? Here's what to know. “Dance Moms: ...

While the reunion brings together several Dance Moms fan favorites, a few notable alums didn’t participate in the reunion, including Maddie Ziegler, Mackenzie Ziegler, and Nia Sioux. In a teaser ...