Although it is not yet clear what Lifetime's reality show "Dance Moms" Season 6 will include, we're getting to know a lot of drama unfolding behind the camera and behind close doors.

It seems a dance competition without nerves and anxiety wouldn't sound as interesting. At least that's what we deciphered when Abby Lee Miller's prodigy Maddie Ziegler recently revealed that her younger sister Mackenzie is fiercely competitive and is jealous of her. 

The sister are two of the oldest cast members on the show, and their camaraderie is quite evident. Recently, Mackenzie cheered her 13-year-old sister when she performed on singer Sia's "Alive" on "The Ellen Show." On her part, Maddie promoted her younger sibling's new song "Sleigh Ride".

However, the "Book of Henry" star revealed that her 11-year-old sister Mackenzie does get jealous of her.

Maddie claimed Mackenzie is sometimes upset she isn't interviewed as much, but was quick to add that the two love spending time with each other.

Yibada quoted her as saying: "But that's just her being my sister. If she was my friend, she wouldn't care." 

Maddie, who recently finished filming "Book of Henry" in New York, has returned to the ALDC team, and has put an end to several rumours and speculations about the star's presence in Season 6 of "Dance Moms."

Recently, Lifetime officially announced that "Dance Moms" Season 6 would premiere on  Tuesday, 5 January, 2016.