Abby Lee Miller (center) is just one of several "Dance Moms" stars targeted by online hackers. Pictured: Abby with two of her students JoJo Siwa (left) and Kalani Hilliker in a promo shot for the Lifetime show. Lifetime

Lifetime has yet to premiere the newest season of “Dance Moms” but that hasn’t stopped drama from occurring behind the scenes. Mackenzie Ziegler, one of the youngest members of the hit dance competition series, as well as several other team members, have reportedly been targeted by hackers.

TMZ reports that cell phones, iCloud, email and PayPal accounts for coach Abby Lee Miller, Mackenzie, 11, and several other unnamed stars from the Lifetime show were compromised Monday night. The hackers, which a personal investigator hired by the cast three months ago is calling the work of four underage “mean girls,” are said to have posted the reality stars’ personal information, including their cell phone numbers, online. TMZ revealed Wednesday the FBI and local law enforcement are on the case.

“Dance Moms” star Kira Girard, who is mom to 15-year-old dancer Kalani Hilliker, seemingly responded to the incident on Twitter Tuesday night, posting a warning to the hackers.

This isn’t the first time the cast has been targeted by online hackers. A representative for “Dance Moms” alums Paige Hyland, 15, and her mom, Kelly Hyland, confirmed to International Business Times earlier this month that their Twitter and Instagram accounts were also compromised.

The hacking comes just days before Lifetime premieres the highly anticipated sixth installment of “Dance Moms.” The upcoming season will follow Abby and her students as they continue their West Coast takeover. “Dance Moms” Season 6 kicks off Tuesday, Jan. 5, at 9 p.m. EST on Lifetime.